Well, what the best way of making money is, really depends on the individual, and: how risk-averse (s)he is; what skills (s)he has; what type of contacts, and how many of them, (s)he has; and so on - so, try not to look so much at formulas from someone who happened to make a lot of money online (to the extent they will actually share their methods), but rather, at what you have to offer, and how far are you willing/able to go.

Now, trading, gambling, and questionable investments, can certainly seem like a shortcut to "fame and riches", but they tend to be too risky for most to be able to have a constant return from them. So, I'd personally recommend starting out small, by nurturing that skill you have, or that you have always wanted to develop, and then offering to work on it for others, before moving on to bigger and better - it's not an easy road either, and there will most likely be a lot of competition, but it's almost certainly the road that will offer you the greatest possibilities in the future.