The brake pedal is located on the floor to the left of the accelerator. When pressed, it applies the brakes, causing the vehicle to slow down and/or stop. You must use your right foot (with your heel on ground) to exert force on the pedal to cause the brakes to engage. If your vehicle has standard brakes, the pedal will move a little bit before it resists. If you have power brakes, you do not need to exert as much pressure on the pedal to use the brakes.
The parking brake can be either a pedal operated by your left foot, a lever under the dashboard, or a lever to the right on the floor. It applies brakes to keep the car from moving when parked or to slow the car down if the regular brakes fail.