What to do when to regain control your vehicle involves in a skid?

FRONT WHEEL SKID

If your car enters a front-wheel skid, ease off the accelerator. If you are driving a car with manual transmission, depress the clutch. With your eyes focused on your "target", try to steer the car back on course. If you don't regain control of the car within 2-3 seconds, THEN depress the brake lightly. If your car doesn't have anti-lock (ABS) brakes, pump the brakes lightly.

Braking will help to transfer power to the front of the car; braking too suddenly, however, can cause the wheels to lock, which will make the skid worse.

REAR WHEEL SKID

You want to turn JUST ENOUGH to straighten out the car, i.e. bring the front wheels back in line with the rear wheels.

As you turn, slowly ease off the accelerator. Avoid the temptation to brake suddenly.