IMO - reading, writing, thinking, computing, etc., at a level to be able to enter colleges/universities and succeed and/or to enter the workforce and not get fired for being incompetent in reading, writing, thinking, computing, etc.
I have always wondered about the folks who "quit" learning. I have met some of them who quit academics: words, symbols, constructs, and logic. THe fall back into heuristics, myths, and opinions, and for the rest of their being, survive as idiots.
Learning is a lifelong process, in fact, I view it as life itself. Change indeed is a rough path until well traveled, and there are some who prefer the well traveled smooth path. I always enjoyed hearing from parents about their experiences in algebra: we never used it. All I could say, you are right, and you never will, but I hope for your children something better. Those Greek stories? why should we know them? Or that Gaul is divided into three parts? Who cares?
Well, we still have wars, and folks die. That is reason enough to learn that literature, and the lessons it imparts.