Hey zos (npub1mmr…s9fw) welcome to nostr!
Most of nostr projects are FOSS and the app maintainers welcome contributions!
First step is to find a project you are interested in. Play around with many apps. Live dangerously, and copypasta your nsec.
Look for projects with a contributing.MD and good first issues label on github https://github.com/damus-io/damus/issues?q=is%3Aopen+is%3Aissue+label%3Agood-first-issue
Start small! Reach out to the devs, establish trust, and see if you like the process.