Woodworking, sounds simple enough, but there’s a wealth of lore in trees and wood; and using old tools properly requires a bit of metallurgical knowledge. Physics, the practical kind, is immensely useful; so is geometry. Books and tools open doors, some with intricate locks and hinges, to visit this world and others.
Grew up on a farm in south Arkansas, not as poor as some people, but no silver spoon. College didn’t satisfy my curiosity, and I moved on to make my living as a carpenter, trying to make sense of living in a beautiful and slightly insane world.
Timber framing is naturally a product of the most fundamental theorems (parallel & perpendicular), counting numbers, common fractions, and basic triangular shapes (3:4:5, etc). Timber, unless it is absolutely dry in which case you have other problems, moves. A lot. The fascination with precision in such work is a precious illusion, not supported by reality.
I have spent all of my life learning, making, and building: creating value; while a criminally irresponsible banking industry has systematically diminished the value of work and reduced skilled trades to banality. Enough, already.