Practically speaking if you want to have that fast money on trading you must have that being active on every event happening on the forum or you must accept all airdrops and join different bounties to have too much of coins and tokens to hodl. Hodl, and if you find that the price is great sell it then and buy coins of your choice or even cash out if you want.
Bounties are a rather slow process though, not sure if it satisfies the fast parameters of the poster. The fastest way I can think off is selling crypto to people on places like local bitcoin, if you spend a lot of money at amazon for example, it's possible to get good discount immediately, for doing nothing. And some people hassle further and buy things for other people with this credit, and receive bitcoin. However fast yes, but not easy, especially considering scams, possible fraudulent amazon codes. But some people do it successfully, especially if all you want is amazon credit purchased with cash.