Welcome to Nostr.

In a little bit you are going to receive some great comments with lots of help from others. 

 Welcome! You'll figure it all out and there's a great community here if you have questions! 

 Welcome!

You can edit a note.... Before you send it! Once done is done.
For deleting a note > see above.
Relays are what you use to spread your notes per say.
Protocol is like how email works, you use many differnet ways to access email, nostr is similar.

Cheers!
 

 Perfect! Thank you! 

 If you are a video person, I would love to suggest my friend npub1lelkh3hhxw9hdwlcpk6q9t0xt9f7yze0y0nxazvzqjmre3p98x3sthkvyz video: 

check it out: 

https://youtu.be/kifwECtwjJQ?si=P9E4RUNJZ_LPnhxf 

 Thanks 

 Welcome, glad to have You in here. You can do all of that stuff. And a relay It is simply a database where your information is stored, you can have multiple and you do not only depend on a platform or application that censors you.