[CharleFKane]

The answer I really want to give, but which isn't very helpful, is: go to a bookstore or to Amazon, find something that looks interesting to you, and buy it.

Don't worry about buying the right book at the right time, or if you'll like it in 50 years, or whatever. You'll have plenty of chances to get this right in the future.

The possibly more helpful, but self-promoting answer: I did a post twelve years ago on my personal blog about ten (plus five) books that were major influences on me. Many of those (11 out of the 15) are non-fiction, and you might get an idea or two from that list.

https://www.sportsfirings.com/?p=1401