Welcome to Nostr!! Search around for hashtags (many times you’ll find whatever you’re looking for with “str” appended to the end  ex: #artstr )  and see what other relays  folks are using. 
There’s no Big Company here to feed you information or demand ID from you. If you have a question, just add

#asknostr

at the end of your post and you’ll get answers very quickly! 
If someone posts something that you don’t like, just Mute them. 
Enjoy your time!!