diff --git a/app/build.gradle b/app/build.gradle
index c5cf1b8..1bb4d9f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,48 +1,50 @@
-plugins {
-    id 'com.android.application'
-    id 'org.jetbrains.kotlin.android'
-}
-
-kotlin {
-    jvmToolchain(17)
-}
-
-android {
-    compileSdk 34
-    namespace "otus.gpb.homework.fragments"
-
-    defaultConfig {
-        applicationId "otus.gpb.homework.fragments"
-        minSdk 26
-        targetSdk 34
-        versionCode 1
-        versionName "1.0"
-
-        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-    }
-
-    buildTypes {
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
-        }
-    }
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
-    }
-    kotlinOptions {
-        jvmTarget = '17'
-    }
-}
-
-dependencies {
-
-    implementation 'androidx.core:core-ktx:1.7.0'
-    implementation 'androidx.appcompat:appcompat:1.5.1'
-    implementation 'com.google.android.material:material:1.6.1'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    testImplementation 'junit:junit:4.13.2'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+kotlin {
+    jvmToolchain(17)
+}
+
+android {
+    compileSdk 35
+    namespace "otus.gpb.homework.fragments"
+
+    defaultConfig {
+        applicationId "otus.gpb.homework.fragments"
+        minSdk 26
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = '17'
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.5.1'
+    implementation 'com.google.android.material:material:1.6.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.activity:activity:1.10.0'
+    implementation 'androidx.fragment:fragment-ktx:1.8.9'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..2b2aafd 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,26 +1,34 @@
-<?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools">
-
-    <application
-        android:allowBackup="true"
-        android:dataExtractionRules="@xml/data_extraction_rules"
-        android:fullBackupContent="@xml/backup_rules"
-        android:icon="@mipmap/ic_launcher"
-        android:label="@string/app_name"
-        android:roundIcon="@mipmap/ic_launcher_round"
-        android:supportsRtl="true"
-        android:theme="@style/Theme.Fragments"
-        tools:targetApi="31">
-        <activity
-            android:name=".MainActivity"
-            android:exported="true">
-            <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
-
-                <category android:name="android.intent.category.LAUNCHER" />
-            </intent-filter>
-        </activity>
-    </application>
-
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Fragments"
+        tools:targetApi="31">
+        <activity
+            android:name=".Activity_Fragment_B"
+            android:exported="false"
+            android:label="ACTIVITY_B"/>
+        <activity
+            android:name=".Activity_Fragment_A"
+            android:exported="false"
+            android:label="ACTIVITY_A"/>
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Activity_Fragment_A.kt b/app/src/main/java/otus/gpb/homework/fragments/Activity_Fragment_A.kt
new file mode 100644
index 0000000..60a62a2
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Activity_Fragment_A.kt
@@ -0,0 +1,28 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+class Activity_Fragment_A : AppCompatActivity() {
+
+    lateinit private var fragmentA:Fragment_A
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_fragment_a)
+
+
+        if (savedInstanceState == null) {
+            fragmentA = Fragment_A.newInstance()
+            supportFragmentManager.beginTransaction()
+                .replace( R.id.ContainerForFragments, fragmentA )
+                .addToBackStack("")
+                .commit()
+        }
+
+
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Activity_Fragment_B.kt b/app/src/main/java/otus/gpb/homework/fragments/Activity_Fragment_B.kt
new file mode 100644
index 0000000..0f1653a
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Activity_Fragment_B.kt
@@ -0,0 +1,28 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class Activity_Fragment_B : AppCompatActivity() {
+
+    lateinit private var fragmentBA : FragmentBA
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_fragment_b)
+
+        if( resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+
+            if (savedInstanceState == null) {
+                fragmentBA = FragmentBA.newInstance()
+                supportFragmentManager.beginTransaction()
+                    .replace(R.id.ContainerForFragments, fragmentBA)
+                    .addToBackStack("")
+                    .commit()
+            }
+            else if( supportFragmentManager.backStackEntryCount == 0 )
+                    finish()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
new file mode 100644
index 0000000..45f061b
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,52 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+
+class FragmentAA : Fragment(R.layout.fragment_aa) {
+
+    private var backGroundColor: Int? = null
+    private lateinit var startAB_Button:Button
+    private lateinit var fragmentAB: FragmentAB
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        startAB_Button = view.findViewById<Button>(R.id.StartFragmentAB_Button)
+
+        if( savedInstanceState != null ) {
+            backGroundColor = savedInstanceState.getInt(FRAGMENT_AA_COLOR_KEY)
+        } else {
+            backGroundColor = getArguments()?.getInt(FRAGMENT_AA_COLOR_KEY)
+        }
+        backGroundColor?.let{ view.setBackgroundColor(it) }
+
+        startAB_Button.setOnClickListener {
+
+            fragmentAB = FragmentAB.newInstance()
+            val bundle = Bundle()
+            bundle.putInt("SetColorAB", ColorGenerator.generateColor())
+            fragmentAB.setArguments(bundle)
+
+            parentFragmentManager.beginTransaction()
+              .replace(R.id.ContainerForFragments, fragmentAB)
+              .addToBackStack("")
+              .commit()
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        backGroundColor?.let{ outState.putInt( FRAGMENT_AA_COLOR_KEY, it) }
+    }
+
+    companion object {
+       @JvmStatic
+       fun newInstance() = FragmentAA()
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
new file mode 100644
index 0000000..3f792dc
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,34 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+
+class FragmentAB : Fragment(R.layout.fragment_ab) {
+
+    private var backGroundColor: Int? = null
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        if (savedInstanceState != null) {
+            backGroundColor = savedInstanceState.getInt( FRAGMENT_AB_COLOR_KEY )
+        } else {
+            backGroundColor = getArguments()?.getInt( FRAGMENT_AB_COLOR_KEY )
+        }
+        backGroundColor?.let { view.setBackgroundColor(it) }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        backGroundColor?.let{ outState.putInt( FRAGMENT_AB_COLOR_KEY, it ) }
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance( ) = FragmentAB()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
new file mode 100644
index 0000000..3f73707
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,62 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.setFragmentResultListener
+
+const val FRAGMENT_COLOR_KEY = "ColorBA"
+
+class FragmentBA : Fragment(R.layout.fragment_ba) {
+
+    private lateinit var startBB_Button: Button
+    private lateinit var fragmentBB: FragmentBB
+    private var backGroundColor: Int? = null
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val backPressedCallBack = object : OnBackPressedCallback(true)
+        {
+            override fun handleOnBackPressed() {
+                if( parentFragmentManager.backStackEntryCount <= 1 )
+                    requireActivity().finish()
+                else   parentFragmentManager.popBackStackImmediate()
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, backPressedCallBack)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        if(resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT){
+            backGroundColor = getArguments()?.getInt(FRAGMENT_COLOR_KEY)
+            backGroundColor?.let{ view.setBackgroundColor(it) }
+
+            startBB_Button = view.findViewById<Button>(R.id.StartFragmentBB_Button)
+            startBB_Button.setOnClickListener {
+                fragmentBB = FragmentBB.newInstance()
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.ContainerForFragments, fragmentBB)
+                    .addToBackStack("")
+                    .commit()
+            }
+        }
+        else{
+           setFragmentResultListener(FRAGMENT_COLOR_KEY) { _, bundle ->
+               backGroundColor = bundle.getInt(FRAGMENT_COLOR_KEY)
+               backGroundColor?.let{ view.setBackgroundColor(it) } }
+        }
+    }
+
+   companion object {
+        @JvmStatic
+        fun newInstance() = FragmentBA()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
new file mode 100644
index 0000000..9c7be1b
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,45 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.setFragmentResult
+
+class FragmentBB : Fragment(R.layout.fragment_bb) {
+
+    private lateinit var sendColorButton: Button
+    private lateinit var fragmentBA: FragmentBA
+    private val bundle = Bundle()
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+            sendColorButton = view.findViewById<Button>(R.id.SendColor_Button)
+
+            sendColorButton.setOnClickListener {
+
+                bundle.putInt(FRAGMENT_COLOR_KEY, ColorGenerator.generateColor())
+
+                if(resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+
+                    fragmentBA = FragmentBA.newInstance()
+                    fragmentBA.setArguments(bundle)
+                    parentFragmentManager.beginTransaction()
+                        .replace(R.id.ContainerForFragments, fragmentBA)
+                        .addToBackStack("")
+                        .commit()
+                }
+                else{  setFragmentResult(FRAGMENT_COLOR_KEY, bundle)  }
+            }
+
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance() = FragmentBB()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/Fragment_A.kt b/app/src/main/java/otus/gpb/homework/fragments/Fragment_A.kt
new file mode 100644
index 0000000..bfa4954
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/Fragment_A.kt
@@ -0,0 +1,56 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.activity.OnBackPressedCallback
+
+const val FRAGMENT_AA_COLOR_KEY = "SetColorAA"
+const val FRAGMENT_AB_COLOR_KEY = "SetColorAB"
+
+class Fragment_A : Fragment(R.layout.fragment__a) {
+
+    private lateinit var startAA_Button:Button
+    private lateinit var fragmentAA: FragmentAA
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val backPressedCallBack = object : OnBackPressedCallback(true)
+        {
+            override fun handleOnBackPressed() {
+                if(parentFragmentManager.backStackEntryCount <= 1)
+                    requireActivity().finish()
+            }
+
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, backPressedCallBack)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        startAA_Button = view.findViewById<Button>(R.id.StartFragmentAAButton)
+
+        startAA_Button.setOnClickListener {
+
+        val bundle = Bundle()
+        bundle.putInt( FRAGMENT_AA_COLOR_KEY, ColorGenerator.generateColor() )
+        fragmentAA = FragmentAA.newInstance()
+        fragmentAA.setArguments(bundle)
+
+            parentFragmentManager.beginTransaction()
+                .replace(R.id.ContainerForFragments, fragmentAA)
+                .addToBackStack("")
+                .commit()
+        }
+    }
+
+   companion object {
+       @JvmStatic
+       fun newInstance() = Fragment_A()
+   }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
index 5e89c44..4d3c910 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -1,12 +1,32 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
 
+    lateinit private var startActiv_A: Button// = findViewById(R.id.startActivityA)
+    lateinit private var startActiv_B: Button
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        startActiv_A = findViewById(R.id.startActivityA)
+        startActiv_B = findViewById(R.id.startActivityB)
+
+        startActiv_A.setOnClickListener{
+            val intentActivityA = Intent( this@MainActivity, Activity_Fragment_A::class.java)
+            startActivity(intentActivityA)
+        }
+
+        startActiv_B.setOnClickListener{
+            val intentActivityB = Intent( this@MainActivity, Activity_Fragment_B::class.java)
+            startActivity(intentActivityB)
+        }
+
+
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/activity_fragment_b.xml b/app/src/main/res/layout-land/activity_fragment_b.xml
new file mode 100644
index 0000000..21b617c
--- /dev/null
+++ b/app/src/main/res/layout-land/activity_fragment_b.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Activity_Fragment_B">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="horizontal">
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/ContainerForFragmentBA"
+            android:name="otus.gpb.homework.fragments.FragmentBA"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+
+        <androidx.fragment.app.FragmentContainerView
+            android:id="@+id/ContainerForFragmentBB"
+            android:name="otus.gpb.homework.fragments.FragmentBB"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_weight="1" />
+    </LinearLayout>
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/activity_main.xml b/app/src/main/res/layout-land/activity_main.xml
new file mode 100644
index 0000000..78fd779
--- /dev/null
+++ b/app/src/main/res/layout-land/activity_main.xml
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <Button
+        android:id="@+id/startActivityA"
+        style="@style/Widget.Material3.Button"
+        android:layout_width="300dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="68dp"
+        android:text="Start Activ A"
+        android:textSize="16sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.498"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/startActivityB"
+        style="@style/Widget.Material3.Button"
+        android:layout_width="300dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="56dp"
+        android:text="Start Activ B"
+        android:textSize="16sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.504"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/startActivityA" />
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="60dp"
+        android:text="I AM MAIN ACTIVITY"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/startActivityB" />
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/fragment_ba.xml b/app/src/main/res/layout-land/fragment_ba.xml
new file mode 100644
index 0000000..d0760a4
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_ba.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#00D491"
+    tools:context=".FragmentBA">
+
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+
+        <TextView
+            android:id="@+id/textViewFragmBA"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="I AM FRAGMENT BA"
+            android:textSize="16sp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintVertical_bias="0.5" />
+
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/fragment_bb.xml b/app/src/main/res/layout-land/fragment_bb.xml
new file mode 100644
index 0000000..43d89e4
--- /dev/null
+++ b/app/src/main/res/layout-land/fragment_bb.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentBB">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="#FFEB3B">
+
+        <TextView
+            android:id="@+id/textViewFragmBB"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="116dp"
+            android:text="I AM FRAGMENT BB"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.499"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <Button
+            android:id="@+id/SendColor_Button"
+            style="@style/Widget.Material3.Button"
+            android:layout_width="300dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="84dp"
+            android:text="SendColor"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/textViewFragmBB" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_fragment_a.xml b/app/src/main/res/layout/activity_fragment_a.xml
new file mode 100644
index 0000000..2d67e58
--- /dev/null
+++ b/app/src/main/res/layout/activity_fragment_a.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Activity_Fragment_A">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/ContainerForFragments"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_fragment_b.xml b/app/src/main/res/layout/activity_fragment_b.xml
new file mode 100644
index 0000000..ed4a3c3
--- /dev/null
+++ b/app/src/main/res/layout/activity_fragment_b.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Activity_Fragment_B">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/ContainerForFragments"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_weight="1"/>
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..e29987d 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,18 +1,45 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".MainActivity">
-
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <Button
+        android:id="@+id/startActivityA"
+        style="@style/Widget.Material3.Button"
+        android:layout_width="300dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="148dp"
+        android:text="Start Activ A"
+        android:textSize="16sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.504"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/startActivityB"
+        style="@style/Widget.Material3.Button"
+        android:layout_width="300dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="56dp"
+        android:text="Start Activ B"
+        android:textSize="16sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.504"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/startActivityA" />
+
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="88dp"
+        android:text="I AM MAIN ACTIVITY"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/startActivityB" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment__a.xml b/app/src/main/res/layout/fragment__a.xml
new file mode 100644
index 0000000..e2357f5
--- /dev/null
+++ b/app/src/main/res/layout/fragment__a.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    tools:context=".Fragment_A">
+
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/linearLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TextView
+            android:id="@+id/FragmentA_TextView"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="272dp"
+            android:text="I AM FRAGMENT A"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <Button
+            android:id="@+id/StartFragmentAAButton"
+            style="@style/Widget.Material3.Button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="92dp"
+            android:text="StartFragmentAA"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/FragmentA_TextView" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
new file mode 100644
index 0000000..2462aaa
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:alpha="1.0"
+    tools:context=".FragmentAA">
+
+
+        <androidx.constraintlayout.widget.ConstraintLayout
+            android:id="@+id/linearLayout"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent">
+
+                <TextView
+                    android:id="@+id/textView2"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="272dp"
+                    android:text="I AM FRAGMENT AA"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
+
+                <Button
+                    android:id="@+id/StartFragmentAB_Button"
+                    style="@style/Widget.Material3.Button"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="92dp"
+                    android:text="StartFragmentAB"
+                    android:textSize="16sp"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@+id/textView2" />
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
new file mode 100644
index 0000000..1ad4540
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentAB">
+
+    <TextView
+        android:id="@+id/textView2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:layout_marginTop="272dp"
+        android:text="I AM FRAGMENT AB" />
+
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..56d231b
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#00D491"
+    tools:context=".FragmentBA">
+
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+
+        <TextView
+            android:id="@+id/textViewFragmBA"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="244dp"
+            android:text="I AM FRAGMENT BA"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.498"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <Button
+            android:id="@+id/StartFragmentBB_Button"
+            style="@style/Widget.Material3.Button"
+            android:layout_width="300dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="108dp"
+            android:text="StartFragmentBB"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/textViewFragmBA" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_bb.xml b/app/src/main/res/layout/fragment_bb.xml
new file mode 100644
index 0000000..ed65c23
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".FragmentBB">
+
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="#FFEB3B">
+
+        <TextView
+            android:id="@+id/textViewFragmBB"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="280dp"
+            android:text="I AM FRAGMENT BB"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.498"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <Button
+            android:id="@+id/SendColor_Button"
+            style="@style/Widget.Material3.Button"
+            android:layout_width="300dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="84dp"
+            android:text="SendColor"
+            android:textSize="16sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/textViewFragmBB" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 34277aa..69e7f01 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,5 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <!-- TODO: Remove or change this placeholder text -->
+    <string name="hello_blank_fragment">Hello blank fragment</string>
 </resources>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bd20018..a6bdfc1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,10 +1,10 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-plugins {
-    id 'com.android.application' version '8.7.2' apply false
-    id 'com.android.library' version '8.7.2' apply false
-    id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
-}
-
-task clean(type: Delete) {
-    delete rootProject.buildDir
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    id 'com.android.application' version '8.7.2' apply false
+    id 'com.android.library' version '8.7.2' apply false
+    id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
 }
\ No newline at end of file