I knew him for about 3 months, hung out with him regularly, before I figured out that he couldn't read. He was very good at manipulating the conversation to make me read things for him without me guessing it.

He paid off his mortgage by his mid-30's.

He taught himself to read and write alongside his eldest daughter when she learned. Keeping up with a kid while learning an entirely new skill is no minor thing.

He built his own house in the corner of a field without planning permission so that no-one knew he was there, and lived in it for long enough that he then didn't need planning permission.

He effectively retired in his 40's, and keeps bees for fun.

They call it "street smarts". He has it in spades. Also just genuinely a fun person to be around.