How to Be a Useful Person

I've noticed that you have limited interest in some of the more advanced math and like after quadratics and stuff, like it's kind of, you don't care. But if you think about something like, like history, you seem to know all of that stuff. Like you're interested in those things. Where do you draw the line on what you think is useful and what you Think is not useful? Some of what I think is useful. He's apparently one of the most like the best strategic minds of all generations. And it's not an awesome guy though.