what is the best site to earn some extra cash on the net?

Writing work is the best paying work online. All others are low paying or require you to invest a bit of money. So decide what you are good at and use that skill to make money. And also first try to know how others are earning successfully and then decide on your plan and strategy. You can check out my profile for some of the earning sites. Keep learning and you will earn. Happy Mylotting!