Think twice before posting anything on #nostr.
Make sure to proofread for grammar errors because once it's posted, there's no way to edit or delete your notes.
Only set write permissions on relays that support NIP-09 (event deletion), but even then, it's not guaranteed they'll respect your request. Also, other random relays might have saved your notes without your knowledge or permission.
Anything you do on #nostr (posting notes, liking, zapping, DMs) should be considered permanent.