Use low gears on slick surfaces, especially hills and curves. Test your brakes frequently and never tailgate. Instead, take your foot off the accelerator and gently turn your car in the direction you want your front wheels to to go. Hitting the brakes or turning sharply will only lock you into a skid. If you can't get control of your car it is better to steer into a snow bank or fence than to risk a collision in traffic.
Visibility is another big hazard of winter driving.
In heavy snow, keep your lights on. Stop and clean your windshield and lights if necessary. Get off the road before you get stranded by worsening weather conditions. If you get stuck in snow, avoid spinning your wheels - you'll only dig in deeper. Instead, shovel snow away from the wheel paths and pour salt, sand, or cinders around the drive wheels to improve traction.