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.
Currently in Finland - single family home in a town with 46k people. Originally from a 2k village in Germany.
We have two daycares, a school and a grocery store 1km from home - here that kind of stuff is integrated in the neighbourhoods where people live. Many elementary schools, some just grades 1 and 2 - by grade 3 they can already easily travel the longer distance to another school by themselves.