The easiest way to earn money online is by doing the data entry jobs. You just need to sign up for a site, vote someone, order something and comment on videos. The only disadvantage is that it pays very little per task, but once you get used to these kind of jobs, you will be able to complete a task faster and as a result, your earnings will increase. If you are good at writing, you can earn more money in a small amount of time. Sites like freelancer, Odesk offer freelance writing jobs.