If you are in a rear-wheel skid, you must release your brakes and turn your steering wheel

If you’re in a skid you should turn into the skid, steer the way the car is turning. You can think of it that you're anticipating that if the wheels to catch, they'll only do it if they're keen in a way the car is going. If you're slipping to the left, and your front wheels are going to the right you'll keep skidding till you hit on to something.