My suggestion is to avoid driving in a snowstorm as much as possible.

But if you must or get caught up in one, this is the right tip. Stay on the main roads. The main roads always get plowed the most often and are priority in a storm.

Secondary roads are not always plowed and not as often. If you are in the country you also risk snow drifts being on the road (and they are very hard to see in a snowstorm). Even in a big vehicle with 4x4 you can still get stuck in a snowdrift. And if you are in the country there isn't help nearby unless you luck out and get stuck in front of someone's house (if they are capable of helping you).

My advice is if bad weather hits, always have a route that keeps on main roads and don't be afraid to stop in the next town. Head to a local coffee shop, you will often find other stranded motorists there as well and information usually finds its way there.

If it gets bad, hopefully most communities have some form of warming center. But don't always expect that to be the case. You may have to stay with kind strangers.