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.

Yeah, I completely agreed with your argument.But I am still confused about investing in cryptocurrency. Which one is good in the market? How about the boon coin?
You really do have a point there bro! And most people just know how to take some advantages to benefit themselves. However, some strategies even though safe, requires a lot of patience and that is one thing I can give to long term traders. Look for the right time to hit and buy very cheap and be patient enough to hit it big when the alt market gets pumped. However, since the trading of BTC direct, I gave up this option unless it is just necessary with my analysis.