Trading, I think is the best way to earn bitcoin. But wi this you have to be patient and vigilant as well. Bitcoin prices tend to sway from a low to high it is proven to be a coin that is very volatile. Some do scalping-- this is how they play with botcoin. They put in money to bitcoin platform when bitcoin prices at are at all time low. They wait for the spike so that they will earn. And then convert BTC to actual money then wait for another episode of low. Then the cycle continues. Some users do gambling but do this if you like taking risk. The returns from it is high but then again the risk is high too. It is like all or nothing. The conventional way of earning BTC and many practises this is through sognature campaigns. This is like advertising in real world. You will get paid simply by posting affixed their signatures.