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?
Its a great skill to have, if you fix something a bit janky, no one is going to notice.
Getting a basic sewing machine, while absolutely not required, opens the door to more efficient repairs or modifications. Like shortening sleeves or pants that are too long. (You also don’t have to learn to do different stitches, you select one on the machine and let it do the hard part)