What can I use to stop my door rattling?

Simple, just go to your local hardware store or homecenter. Buy a rubber insulator gasket that adhears to the door jam. Your door has a little space between to jam and the door and is rattling when the wind blows. This gasket is generally used as an insulator for preventing cold air from blowing through the door gap but will fill your gap and work effectivly for your rattling problem.