I wish I had bothered to publish all of the side dev projects I created while I was at SFDX, but, I was feeling quite private and all, and they are stored in a private repo atm. I think in total, I had 11 projects? I remember building the space ship, the recruiting app (twice), and had a number of DE's all named after LOTR places (bc, what could possibly derail you from writing apex unit tests that pass with 98-100% code coverage when the SF Developer Environment you're working in is called ROHAN and you're listening to The Riders of Rohan? NOTHING CAN DERAIL YOU WITH THE MIGHT OF THE ROHIRRIM!!!!!!!!)
Now that you’ve created a Salesforce DX project, what’s next? Here are some documentation resources to get you started.
Do you want to deploy a set of changes, or create a self-contained application? Choose a development model.
The sfdx-project.json file contains useful configuration information for your project. See Salesforce DX Project Configuration in the Salesforce DX Developer Guide for details about this file.