I suppose it would be mostly practical skills, cooking, fixing things. Usually had to be done by people themselves.
Maybe also mental things like navigating (with or without paper map) and remembering their daily and weekly agendas.
What other things would be a big difference with the people today?
Using a card catalog at the library to look up books.
I worked in a private library that still had it’s card catalogue up until 2005. People were always ripping out the cards (there was something like a metal knitting needle that passed through a punched hole in each card to stop idiots from destroying the catalogue, so the gobshites ripped them out instead).
The early digital catalogues weren’t great so the old card system persisted.
I never learned this. I always just browsed around and read what caught my attention. Maybe if I was doing research, I would have had to learn it.
It was a fairly regular part of our public school education