[proc0]

I think start with a local setup, make sure changes are updating locally as expected. Then hit the docs, and have them ready to look things up, although browsing through them is also helpful at the beginning.

As far as reading and understanding the code, I start with entry point and make my way through doing a mental map. Once I understand how the app structure I setup and some of the conventions, I dive in to specific features and try to make changes.

Additionally, I like to diagram things as well, just for my own mental map model. Depending on the tech stack there could be libs out there that diagram the app with a way to navigate, and this is also really helpful.