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 think trading is one of the good way to make money with cryptocurrency though I did'nt try it yet.
I tried mining before but it take a lot of time to earn.
As a newbie here in crypto world, joining in a bounty campaign is the way to earn money. Then I can do trading after I get my earnings in this campaign.