1) Assume that other cars are being driven by drunken teenage idiots. There are enough that are distracted, inattentive, unskilled, or just plain stupid drivers out there that your best bet is to imagine the dumbest thing they will do, then plan on them doing it.
2) If you don’t know how your car works, don’t drive it! My wife won’t drive my car because I have three pedals instead of two. You should know what those shiny little things sticking out of the doors are called (mirrors!), what they do, and actually use them. How about that little lever on the left of the steering wheel? Did you know that that can keep people from running into you when you turn or change lanes by letting them know what you’re doing? If others don’t know what you’re doing, odds are you don’t know what you’re doing either, which in turn means that you really shouldn’t be driving.
The next few reflect my decades of New England life, and are most applicable to winter driving.
3) The brakes stop the tires from rotating; that may or may not actually affect the speed of the car. That goes double in the rain, and triple in the winter.
4) Upset the car, and the car will upset you. Cars have a certain balance to them. Rapid movements tend to make them unbalanced. Unbalanced cars tend to lost traction far easier than balanced cars. Losing traction leads to plowing, spinning, and other things that may make you unhappy. For this reason, in slippery conditions, I use the gas and brakes less to control my speed (I use my shifter for that, even in an automatic) and more to control my fore/aft weight distribution. And every move I make is made slowly and smoothly; ease into the brakes, steer gradually, etcetera. Tires have only so much grip to split between braking and turning, and that doing one reduces traction available for the other,
@snowberry I generally apply my brakes early and gently. Pumping them tend to “jerk” things around in a destabilizing manner. If you need to pump the brakes to stay in control, you really need to work on your braking technique. It’s a proportinal control, not an on/off switch; see #2 above.
Oh, and since many cars these days have ABS, you may actually lose control. The point of ABS is not actually to reduce stopping distance, but rather to allow one to retain full directional control while the brake pedal is on the floor. Tires have only so much grip to split between braking and turning, and that doing one reduces traction available for the other. For those of us without ABS, a gentler touch on the brake pedal works. ABS merely has a computer handle a task that is normally handled by driver competence because modern drivers are too lazy to become competent.
5) You don’t need traction, you only need control. Watch some drifting, or WRC rally racing. Drive in the winter in the Northeast. You will see most cars sliding, but many of them will be sliding under the complete control of their drivers.