With due respect, I would like to inform you that online earning is definitely possible. There are a lot of opportunity to work online. But you have to be an expert in any particular subject. The most important thing is that for online earning skill is a must without it, we cannot earn money from online. There are lot of category such as Web Design, Graphics Design, SEO and Data entry task. If you ask me, which one I should start learning, I will definitely say you that you learn which task you like most. Web Design is the most largest category for outsourcing. Graphics design is also. But SEO is a kind of work which will take only 2/3 months to learn.
I love to suggest you to learn seo task and you can earn a lot of money by doing this task. If you are expert in this kind of task, the client will find you to perform their task.
Best of Luck.