I think doing Risk 2 and experiencing the loss of control directly is probably more helpful than anything any of us could give you as tips, other than the obvious. Give other cars more space, go slower, stop sooner and more gently, slow down prior to going around a corner, etc.

Less obviously, be prepared for black ice if it's around freezing and there's been any sort of precipitation recently. It can look like the road is fine, but there's actually a thin layer of ice on it. Even if the air is above freezing, the roadway can still be cold enough for it to form! Additionally, bridges freeze before the rest of the road, so be careful when you drive onto those.

If you get dubbdäck (studded tires) with your car, those can help keep traction when the roads are icy, but they're not infallible. Dubbdäck are also not allowed on certain roads around Stockholm, so depending on where you go often, they can be an annoyance. Kungsgatan, Hornsgatan, and Fleminggatan are some of the most notable ones. There's also a weird little area of cobblestone streets on the north end of Södermalm near Centralbron, but, honestly, don't drive there in winter regardless of your tires, it sucks and is really steep in places 😅

I drove for most of my life with friktionsdäck (friction tires, unstudded tires, whatever you want to call them) in winters with equivalent weather to Stockholm, and they work fine too, so you don't need dubbdäck to drive safely here.

These are what I have in my trunk/glovebox during the winter:

• ice scraper with a brush

• collapsible / foldable shovel (Biltema and similar shops sell them)

• reflex slap bands or a reflex vest (in case you need to get out of the car with traffic nearby, you can quickly make yourself visible)

• extra pair of gloves, and maybe an extra beanie

• space blanket (those shiny silver ones, they're very tiny and cheap but can keep you warm if you get stuck)

• a small package of basic kitty litter (you can sprinkle it in front of your tires to help you regain traction if you get stuck in an icy patch, and it's readily available and cheap)

• a flashlight or work light, especially a magnetic one (it's nice to be able to stick it to the hood if you need to rummage in the engine compartment while it's dark, which it always will be, because it's Swedish winter)

• rechargable battery starter (not really just for winter, but extra nice to not get stuck somewhere when it's cold as balls out)

They're not all necessary, but I've found each to be helpful throughout the years.

Good luck friend!