Welcome to nostr Zoë! Some things might feel overwhelming but there is no dumb questions so keep em coming as you learn more! Many people like to use the #askNostr hashtag too when asking all kinds of questions on here. 

Seems like nostr:npub18ams6ewn5aj2n3wt2qawzglx9mr4nzksxhvrdc4gzrecw7n5tvjqctp424  covered your questions pretty well in his reply.