A skid is usually caused by the driver's failure to react in good time and by driving too fast for road conditions.
Any sudden steering, braking or accelerating action is dangerous on a slippery surface.
Give yourself time to react. Look ahead and read the road conditions.
Because someone else is foolish enough to drive fast, there's no reason for you to be misled into thinking the conditions are safe.
If you have a car with manual transmission, shift gears before you reach the upgrade of a slippery hill. Shifting halfway up may cause the wheels to spin.