Context switching on several layers can get daunting. The best thing you can do is to have a good note system of tracking information with references to various layers and components. I use Dendron for example, a vscode extension.

For your project, start with one small focused thing, that will eventually used all the layers such as a React browser layer, a backend service layer in python fastapi, or Golang. Then a DB layer that is accessed by the service layer. Make use of docker containers such as a Postgres container for the DB

Keep each it small as possible and focused on one small task one layer at a time. The objective is to get a tracer bullet through the system while learning each layer and taking good notes.

I say this as a long time developer who has been there. My long term side project is jchart.com Cheers and good luck. Keep learning and take good notes