Nostr.band is Nostr's most important app in my opinion.
Discussion
What are some similar apps?
Check out nosta.me/npub14q8uffuxxnhzd24u4j23kn8a0dt2ux96h5eutt7u76lddhyqa0gs97ct2x
It can also render posts on the web if you remove "nostr:" from the note ID