Welcome to #Nostr

Suggestion:
Follow topics using hastags, type #rockclimbing, click on any hastag and you will have the option to follow it if using the right mobile or web browser client

If on Android, 

#Amethyst is an excellent choice, feature rich, supports privacy, tiktok like feeds, multi user, supports Amber (more more security), TOR, private chats, etc.

#0xChat is a good alternative, more like Telegram, including chat groups, channels and voice and video calls, all encrypted e2e

if on iOS:
https://media.tenor.com/-SP6MqFnCBEAAAAC/but-why-nevermind.gif

Enjoy Nostr!