Which language do you know? :)
nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z what you suggest to learn for help to building on #nostr, write new nips and so on? Thanks!
Discussion
Javascript
Just look for the NDK or nostr-tools. The two libraries are awesome to kick off development.
You can also try https://github.com/ostyjs/create-osty