How do you prevent auto theft?

How do you prevent auto theft?
ten ways to prevent auto theft is
1. Have an anti-theft device or alarm system on the car.
2. Always lock the car doors. Lock the doors even if you are entering your residence to grab that one item that you forgot to take on your way out the door.
3.Keep your window ups. Your vehicle windows should always be up when no one is in the vehicle.
4.Do not leave personal items in the car in plain site.
5. Do not leave the car keys in the ignition!
6.Have your windows tinted. If possible have your vehicle windows tinted. With tinted windows it should be more obvious to any by stander if a stranger going to break into your car, having tinted windows makes it harder for a possible thief to see what belongings you have in a car.
7. Get an aftermarket anti-theft device.
8. Do not leave a vehicle on and unattended.
9.Do not leave a spare key where a thief can find it.
10.Park in a public place with plenty of light.