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?
I still write thank you cards. People really like getting them. In my mind, it’s worth the [small] investment of my time and effort to show my appreciation for something.