how to make an efficient fire.
how to make some bast shoes or something similar.
how to sew clothes with primitive tools. how to make pelt and fabric from wool or plant fiber like hemp.
enough sheep that you can keep track of, protect and keep breeding on. you can milk them, make butter and fermented stuff like yogurt and stuff like that.
they provide wool continuously. when you slaughter them you'll get meat and hide. learn how all those things are made. https://www.youtube.com/watch?v=U54HRmglYEA
you need to move the sheep around to feed them.
maybe some chickens for eggs to provide good protein and cholesterol. I don't know how to feed them though.
fruit and crops that'll produce seed that you can plant and grow.
a place to fish. how to make a net, how to mate a ruse, how to make a hook and a strong fishing chord.
how to make traps to catch wild animals. if you catch some rabbits or hares you can keep them as long as you can feed them, maybe even breed them, and then kill them when you're hungry. https://archive.org/details/HappyPeopleAYearInTheTaiga
knives, axes, saws.
how to make chord and rope.
how to build without nails.
how to protect your livestock from predators, wolves bears, foxes, big birds of prey.
basic smithing. how to harden steel, how to work with it and so on.
how to do basic foresting (food forest permaculture) how to thin the right trees, when to do it etc. https://www.youtube.com/watch?v=sRPP4Ilpxso
there are many more things. that's just a short list.
Ideally you'd have at least 2 other people with you that you know you can trust in the most difficult situation.