And for less than a hundred dollars you can be virtually guaranteed that your car will start, even on the coldest of mornings. A side benefit of this is that you'll have instant heat in the morning. Actually, this might be the main benefit as far as your tush is concerned. Make sure your rear window defroster works. Know your car.
Every car has different handling characteristics.
You should know what your car can and cannot do in the snow. You should know if it has antilock brakes and traction control, how they work and how they help. In fact, you should practice using these features in an empty parking lot before you have to use them on the roads. See your owner's manual for details. Nothing will make a bigger difference than four good snow tires.