Yeah. I really think there is only so much people can really keep up where they know it. Preppers pretty much teach themselves stuff that was common knowledge in the past. those older people lack all sorts of basic knowledge. It comes down to what you need to know. The most useful basic knowledge is just reading and reading comprehension and math helps a whole lot to up to a point. Enough to read how to books and such. good to have enough experience that it does not have to explain how every tool works. of course we have video instructions now so hard to say how much that is needed. Still math, reading, writing. They help a lot in general cognitive understanding. I highly recomend elementary logic.