Understand the pieces
What each kind of address does, and what the mail protocols are for.
Something like [email protected] is yours to set up. This site explains it in plain words, one step at a time.
An address points to a mailbox, the place where your messages are delivered.[1]
Where your messages are kept. It has its own password.
A second name that delivers to a mailbox you already have.
A way for apps to read mail that stays on the server.[2]
What each kind of address does, and what the mail protocols are for.
Add an account to your phone and plan a move to a new provider.
Catch-alls, automatic replies, and what to do when someone leaves.
It carries your outgoing mail. Its aim is to transfer mail reliably and efficiently.[3]
No. You can read mail in a web browser too.
The one on why use email at your own domain.