I think that all basic everyday skills like baking, cooking, knitting, repairing stuff, camping, some diy builds in woodwork and such are good and things we can use in solidarity with others as well although they might seem mundane. But getting a bag of potatoes to go a long way for a lot of people is definitely a useful skill, one I learned from my prole grandma. Also fermentation and preserving food.

Food foraging if allowed/able to do that. Berry and mushroom picking. Fishing if eating fish. Learning your plants: edible wild plants, berries and shrooms even if not able to go get them.

A basic skill in orienteering which we thankfully learn in school. If already familiar with it, keeping it up by hiking or some sort of nature shenanigans.

Rowing and skiing, these are related to my location, but reassure me that I could disappear in the woods winter or summer and move relatively swiftly.

Gardening or learning to grow your own food or a part of it, maybe urban shroom gardening or micro greens if stuck in an apartment building.

Some self-defence sports also, they helped me reassure myself that I can fend for myself if needed.

We have been making a lot of stuff from used pallets for our tiny backyard. We make our own furniture or repair used stuff as well and bake all our own bread which I also gift to others.

Going into a makerspace to do crafty stuff can also be a way to find likeminded folks or people who could use hints in the right direction.

I used to target practice as a kid with an air rifle, but I want to go take an archery class next. A hunting bow might be a good thing to own, for food and other things.