Good morning and welcome to #Nostr

Suggestion
Follow topics using hastags, type #rockclimbing, click search and of any hits, click on one of the hashtags and then follow

If on Android, Amethyst is an excellent feature rich client, supports privacy, tiktok like feeds, multi user, TOR, private chats, etc. 0xChat is a good alternative, more like Telegram, including chat groups, channels and voice and video calls

Enjoy Nostr!