The answer is there is no easy answer. If you are a financially disciplined cheap ass and you put your $ in a tax sheltered diversified, dollar cost averaged index fund and hold for 40 years, you are almost guaranteed to be a millionaire (short of some crazy catastrophe or collapse of a system) by the time you are in your 60s (after working and investing for 40 years).
Unfortunately, the best evidence (I have been led to believe) shows that actively moving $ around (as opposed to throwing it in funds that track the big 3 indexes) doesn’t work. As Ben Stein once said (I’m paraphrasing): “Unless your name is Warren Buffett, you can’t pick stocks.”
But if I were to break from this prudent advice and invest in ideas about the future, I’d listen to what James Altucher & Peter Thiel are saying. As is quoted, “Thiel said, ‘Ideas have more value than money.’”