@MaureenNYCNJ No worries at all! Just ask whenever you want.
Searching is easiest by hashtag (there's no text search), you can see the posts of everyone that your server is connected with: thousands of servers. They can all talk to each other (except some servers get defederated [cut off] if full of trolls, neo nazis, etc).
My best tip is to look at the replies about a subject you like to find more people to follow. And look at the profiles they follow.
Best wishes!