Trading is a good way. Setup an account on an exchange and buy a little of a cryptocurrency you are interested in. Study the charts and try to buy in a dip of a popular coin. Once you bought a coin, set a sell price a bit higher enough to offset your trading fees and to make a small profit. Rinse and repeat until you grow your stack. Just remember to buy low and sell high. 
A very example of trader. Of course if you buy low you must sell it high for you to have profit don't buy low then sell low you are going to broke there is no profit at all. Traders must not emotional that buy it in low price then sell it also in low price traders must be wise and have enough knowledge about dealings, about buying and selling. Must sell it a bit higher than the price when you buy it before.