you can find the pressure on the door side , normally, it is about 32psi or 30, 29, etc, depanding the car.
and the pressure of your 4 tires should be same.
tire is very important thing for brake and steering, and others.
check tire pressure oftenly, it is good for your safety and gas saving.
anything about the car, mail me aicheyizu@gmail.com,
I am studying the automechanic now.