It's a very rich protocol with many advanced features but here are the basics:

1. Like twitter/x: Follow people, post notes, write comments, use hashtags. Send direct messages (DM) 2. Like Instagram: watch/post just photos or just videos 3. Like ebay: Sell or buy stuff 4. Like reddit: join public communities and post or read 5. Like slack: create private groups for chatting with friends or colleagues 6. Like Skype/zoom: voice and video calls with a person or a group 7. Like twitch with live video streams 8. Like nothing else: send and receive bitcoin (lightning)