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?
If you consider them to be inversely proportional to social disorder, social skills would be at a nadir in 1975. But, there’s other ways to look at it, of course.