What's a skill that's taken for granted where you live, but is often missing in people moving there from abroad?
I was thinking about that when I was dropping my 6 year old off at some hobbies earlier - it's pretty much expected to have learned how to ride a bicycle before starting school, and it massively expands the area you can go to by yourself. When she went to school by bicycle she can easily make a detour via a shop to spend some pocket money before coming home, while by foot that'd be rather time consuming.
Quite a lot of friends from outside of Europe either can't ride a bicycle, or were learning it as adult after moving here, though.
edit: the high number of replies mentioning "swimming" made me realize that I had that filed as a basic skill pretty much everybody has - probably due to swimming lessons being a mandatory part of school education here.
Walking on a slippery surface. In Scandinavia all kids learn to walk on ice and snow, where you don't have a solid grip while walking. When people from tropical areas migrate here at an adult age they tend to have a hard time walking around at winter. This also affects the ability to learn skiing. I have seen a ski instructor giving up on a person, due to this.
It gets really fun if you learn to use it to your advantage. For example, our driveway goes up an incline, so when I shoveled a row all the way up to the sidewalk, I just slide back down.
That way I'm much faster.