Clean your bike
This doesn’t have to be a full clean where you drench the bike. It can be just a quick wipe down.
What happens in the winter is that, when the roads get gritted, the salt speeds up corrosion and rusting.
Wipe down the bike frame and undercarriage with a damp rag and a bike-specific cleaner. If you have rim brakes it’s particularly important to wipe them down to get the salt off the rims.
If you want to get a bit more involved, you can also clean your chain. All the dirt from the road gets attracted to it. This is why you don’t want to over oil your chain either; that oil will attract more dirt and grit from the road, and can turn into a sandpaper paste that, when you pedal, grinds away and will wear the parts down faster.
So wipe down the chain, then add a little bit of oil, then wipe that off as well. This will help prolong the life of your chain.