NWGS2 has a point here.
Morally is it right that money is used as an instrument to make money?
Like the from the umpteen trillions of dollars of forex traded every day? Possibly not.
But I've been making from shorting the Nasdaq. Even I have been leveraging the move times -20.
Nobody can say it hasn't been predictable.
So when it drops 5%, I double my money, simples. Sell at end of day. Next morning, have another look. As long as the trend is A LOT, up or down, what you do is open the trade and watch, with your finger on the stop button.
"Pro" accounts have higher levers. (They can also use Options which mean much higher levers. Amateurs can do that too, but I haven't.)
It's not really hard. You look at the screen and follow everyone else. It feeds itself - positive feedback. People buy because it's going up. Same when it stops and falls, but have a look, it's not that sudden. Overnight is where the major risk is, so don't do that.
Billionaires will have made several billions per billion, not millons.
Though there is a limit, if your trade is big enough you affect the market. Not a problem at the millions level in a trillions market.