Earning bitcoins isn't as simple but not that difficult too..
Earning methods comprises of farming faucets, trading and mining.
Farming faucets isn't a good method. Its quick though but very less paying. Another method is trading. A tip here is that when you have a good amount of bitcoins, you shouldn't be in a hurry to sell them. Waiting for price hike can be better and more earning. Yes, there's a risk here that price may go down too, but without risk, you can't progress.
Now, for mining working in groups can make you a little bit more earning as you will be able to mine more in same investment.
Well, other methods like gambling and ransom and kidnapping are there but I don't guess it will suit you.