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?
They stopped teaching it here in the US, which makes me wonder what people will use for a signature.
My son is learning it in 1st grade at his school.
Not entirely, my son still had to have lessons on it in elementary school for some reason.