Make sure the door is locked when going out of the car. Car thefts knows how to" jump the lock" and can easily start the ignition immediately.
Make it a habit to close all the windows, hooks can be used a partially open window to release the lock.
As much as possible, do not leave valuables in your car. If you really need to leave them, make sure to put them in locked trunk or hidden somewhere to keep out of sight from outside the car.
Park the car in a well-lighted area, isolated areas are most likely the target of thefts.
Never leave the children in the car even for a short period of time. There is a great risk for them and for the car to be stolen.
When in the road, be alert always and keep the phone handy for emergency calls.