Ask HN: What trick of the trade took you too long to learn? 12 months ago
I didn't start investing until I understood it.
This is a fantastic course. It covers a lot of ground.
If you want to actively invest, this will help you learn the mechanics. But in the end, what you really learn, is that you can't beat the market.
https://ocw.mit.edu/courses/15-401-finance-theory-i-fall-200...