Best thing to do is sign up and look around, find people to follow, etc.

If you use Android you want Amethyst. If you use iOS you want Damus. For desktop I like Snort.social.

To find people to follow:

Twitter users with verified Nostr keys: https://www.nostr.directory/

Trending people and posts: https://nostr.band/

Me: xanny@stacker.news

If you use the Orange Pill app, there's a field on there for Nostr public keys too, and from what I've seen most people on it have that filled out.