For better understanding and remembering defensive driving techniques on curves you should understand how driving works when a car reaches a turning point. Consider the role of centripetal and centrifugal forces. The force responsible for the change in direction is called centripetal force. Centripetal force is necessary for an object to move with circular motion. The force that pulls out from the center on a body in circular motion is called centrifugal force and it increases with acceleration. Centrifugal force results in strong outward pull on your vehicle.
So what you need to do before entering a curve is slow down. Lowering your speed when you're already on a curve may cause your car to skid.