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.
Dealing with winter. I live in the rural upper Midwest, where winter can hit -20 with whiteout blizzards, week-long power outages, and car-burying snowdrifts. I've seen too many people move here from warmer places and think "I guess I'll buy a warmer coat and a snow shovel", rather than "I should have a backup generator, a backup heat source, a few barrels of spare fuel, a month's worth of stockpiled food, and at least two different pieces of heavy snow-moving machinery tested to be in good working order".
I had a friend visit from London, (the real one, not one of the many towns in the US) in February one year. I warned him he needed heavy winter gear. I picked him up in Indianapolis. He deboarded the plane in a track suit. I pulled the car as close as I could to the terminal, and he made a mad dash for the car as I loaded his luggage. I asked him if he had any heavy winter gear, and he replied, "I'm wearing it!"
Off to Walmart we go then, I pulled up right next to the door and let him dash inside. Parked the car. Found him bewildered and lost in the women's clothes section. Took him over to the hunting and sports section to get him a real coat, and coveralls. He was much happier when he left Walmart, and asked me why I didn't warn him.
I just asked him what he thought it meant when I told him it was -26° C
He said he thought I was exaggerating. SMH
Apparently there have been issues when US and British forces have worked together before du to the "I thought you were exaggerating" mindset.
The brits have a tendency to downplay really bad situations to the point where, "It's actually quite chilly" means "We're in deep shit". I read somewhere that this caused serious miscommunications several times, because Americans didn't understand that brits were downplaying things, while brits though the Americans were always exaggerating.