Also #hashtags are kinda like the public channels on Damus
Try Nostr_Console. It’s a console client that lets you join public or encrypted channels and create them. Public chat/channels are part of the NIPs https://github.com/nostr-protocol/nips/blob/master/28.md
Discussion
Well but I’m referring to channels where you post something that doesn’t go to the global feed.. only those in the channel see it