A note, a reply to a note, raw data view of an event, a npub-to-follow button (and the inverse of it), a zap to a note, a thread with note replies and the note, etc etc 

 And this is a new learning resource of a Dutch dev which I follow (he is a PWA expert) https://dannymoerkerke.gumroad.com/l/mastering-web-components?ref=modern-web-weekly.ghost.io