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?
It’s absolutely an essential skill. I have clothes going on 20 years old that still look quite nice because I am capable of mending them. Even if you don’t ever use a sewing machine, hand-sewing basics are so useful.