This depends on the individual involved. If you have writing skills, you can opt for article writing. If you have a passion for daily events as they unfold or you are an ardent follower of news as they break worldwide, then you can decide to own your own blog.
You can also earn money from this by monetizing your blogs either through Google ad sense or other ones available. If you have interest in photography or you are a photographer or graphic artist, you can take pictures, upload and sell them online. This is mostly good as a freelance job. You could make money by helping people out of their problems.
There are one thousand and one issues that comes online daily. You could find out a niche for your self and make money in that area. Taking surveys is the major icing on the cake or probably the best profitable job online of all time. It entails you signing up with legitimate online survey companies, fill surveys as they come and you get paid.
Surveys are the best profitable online job around. You get to review products as they are manufactured or released into the market and give feed backs and you get some cool cash just for your opinions.
This even makes you to feel at ease knowing your account will be credited each time you fill a form online rightly. Proper investigation and the right signups will give you legitimate online job that you can do.