That really depends on how you would like to contribute. For most major languages there's some sort of lib/sdk available for nostr. What to pick mostly depends on if you want to contribute to specific clients/microapps/webservices or write something new on your own.

Thank you for the reply!!! I learned a bit of Python back in the day and liked how it worked, would it be worthwhile to look into learning that? I’m not sure of what languages most clients are in. I use Plebstr at the moment and would love to contribute to it if I could!