As you are using damus, which is iOS‘s best client for now you can see some recommended relays in its settings on the left. Just connect to all of them and you will see most of the notes 😉
Welcome!
And when I create a post, is that post automatically in all relays?
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No one knows
In all relays you‘re connected to AND have write settings set (not cinfigurable in Damus yet).
Some relays are paid relays, your pubkey only gets rights to write if you paid a fee. This prevents spam written on that relays