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.
I grew up in the US northeast. The general lack of knowing how to dress warm everywhere else is pretty surprising, so I guess that’s the skill I’d pick.
Swimming. It’s sometimes dangerous for foreign children to see Dutch kids swim and try to join them.
Being able to recognize poison ivy. Growing up in a forest, it was one of many basic automatic skills learned in childhood, and I see and avoid it without much thought. I’ve had to prevent many friends from other regions or countries from causing themselves serious harm by ignorance of poison ivy, though.
Rural Japan.
My kids (2 and 4) can use chopsticks already. Plenty of restaurants around here where you won’t see a spoon, fork or knife. (However, it’s certainly possible to ask the staff for western cutlery, and in the main cities they’re more likely to be prepared for that question)
Driving. Moved here from Bangladesh to UK. I did a big mistake by not learning to drive in my country. Now its too expensive here to learn. Here driving is required if you want regular job well paying jobs. Don’t be like me. Learn how to drive.