From the top of my head:

Everyone forgets how to drive when it first snows. Try to avoid driving as much as possible during the first few days of winter.

Stick to busy roads if it recently snowed as they get plow priority, and the heavy traffic will help pack down the snow which will make it less slippery.

Fresh snow is a heck of a lot more slippery than snow that fell a few days ago.

4 wheel / all wheel drive is great, but you don't actually need it. If your car has traction control and a good set of tires, then you've got everything you need to drive in the snow with confidence.

Snow tires are a worthy investment. People think that you don't need snow tires if you have all seasons, but there's no comparison to tires that are specifically made to be driven in the snow.

The posted speed limit is for ideal weather conditions. If there's snow on the ground, then that's not ideal, and you need to drive slower than the speed limit if you want to be safe and not fly off the road. One time a car passed me and about 2 miles later I saw that exact same car in the ditch. You don't want to be that person. If you are that person, then everyone that passes you will be silently judging you while you sit there and wait hours for a tow truck because 30 other people all did the exact same thing at the exact same time.

Not really snow related, but cars with old batteries have a really hard time starting when the weather is at or below zero. If your battery is more than a few years old, it might be time to get a new one.

Bridges will freeze before anything else when the temperature gets below freezing. Just because the roads aren't slippery doesn't mean that any bridges you go over will be the same.