There are many ways to earn money via internet.  There are many sites offering online jobs in return to service you will rendered. But before being employed or getting a good career online, it requires some qualifications that you must meet.  Meaning, you can only find online job if you have skills, talent and experience fitted to their job qualifications.  You have to passed also some aptitude and qualifying exams and undergo interviews.  Then if you prove them that you are qualified to the position, then you have the chance to get an online career.  

On the other hand, there are also some sites asking services in return of bitcoins.  Some are through typing captcha, joining signature campaigns, advertisement, and the like.  But whatever online career you enter, you must put in mind that you have to do your best and give all your skills to be able to maintain it.  You have to provide quality service and maintain good reputation to get another chance to be employed again when your project or campaign is done .  It is not just about earning money instead it is also creating a good and lasting career.