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?
Not OP, but I believe there is a big difference between reading a book or longform article vs 3 paragraphs in a Fediverse thread. I certainly feel it when I sit down to read longform (but i still often read longform).