Welcome to the future! What kind of questions do you have? I’ll try to answer any you have
Discussion
I mean how can you find some communities and also make topic trend?
Well there’s no trending topics on nostr right now. You could try searching hashtags (i suggest #grownostr ), scroll through the global feed, or find someone you like and follow a bunch of people they follow! You could actually go to nostr.band on the web and check out popular accounts and notes from today, but fair warning that it will mostly be bitcoin related.