Paragon GAS (P-GAS) is a gameplay ability system sample that teaches developers how to use several of Unreal Engine features together to build a GAS-powered combat system using free FAB store assets.

The Unreal Engine 5 project, written in C++, which I used in the tutorials.

Unreal Engine Documentation Project

UE5 Blueprint Compiler Extension demo

Recipes for Unreal Engine 5 - Enabling devs to get started with UE5 games development