Good winter tires (Nokian Hakkapeliitta in my case, but there are plenty of good winter tires to choose form) plus traction control and ABS will help a lot, but you also need to modify your driving behaviour as the car can only do so much.
Give yourself more time, apply all inputs (gas, brake, steering) slowly and deliberately - sudden movements are more likely to give you a bad time. Understand how your car behaves in various conditions, empty mall parking lots are good for this. Leave more distance between you and the car ahead of you. Know what do to when you lose traction. Keep your car maintained - properly inflated tires, functional wiper blades and keeping the washer fluid topped up are important. Keep your gas tank at least half-full, which helps during unexpected delays and the additional weight helps with handling. Know what spots are bad in your city and avoid them. Know how to get your car free when it's stuck in snow - if you're going to rock it out, you'll probably need to disable traction control to do it successfully.
Personally, I also avoid driving the first day or two after the first big snowfall. This gives the city time to deal with the snow and gives other drivers time to re-learn winter driving.
Source: I've daily-driven a RWD car for years in Edmonton, AB.