if/when you were 18 what knowledge would/did you gain from the internet that you could recommend to others -- books, lectures, video series ect.
Is going through the khan academy videos on finance or economics worth it?
I've gone through the basic stuff of interest rates, debts, and tax sections.
Essentially, I want to learn how to waste my money on the stock market. Where is a good place to learn how?
but really OP I wish I knew about index investing. Google "how to win the loser's game" it's a BBC documentary. Also read something by John Bogle.