Sarcastic answer - Buy a door of the same colour that is not rusty?
Looks like the door skin has rusted, so what do you want to do?
The second picture is mostly dirt - it's only the bottom edge that's split and rusted from frequently falling open onto the pavement.
I'd really just like the rust to not spread. It's low enough down that I don't care how it looks as long as it's roughly the same colour.
@lynx started
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Sarcastic answer - Buy a door of the same colour that is not rusty?
Looks like the door skin has rusted, so what do you want to do?