About nostr? Tbh, I’m still gathering sources myself. But mostly it is via GitHub. And since the only programming tool I have in my arsenal is python, the sources are quite limited (as far as nostr goes). Mostly it is js, which I’m dreaded by and kind of hate. As for building on nostr using python, there’s this one repo that I used (python-nostr) to experiment with nostr dev.

Please ask more and while I may not be able to answer questions, I may just be able to point you in the right direction.