Specific Knowledge is knowledge that makes you one of a kind. It undercuts the formal education system.
You can’t train for it, otherwise someone would learn it and replace you. There’s no clear road map or “career path” to follow.
To gain specific knowledge, quadruple down on the stuff that feels like play to you but looks like work to others. Ask good questions, create, fail, iterate, and experiment again.
New or rapidly developing industries, whether glamorous or not, very often provide more opportunities to get rich than established sectors. The three reasons for this are availability of risk capital, ignorance and the power of a rising tide.
— Felix Dennis, How To Get Rich