Fill out surveys online.

Companies who want to know what’s on the minds of their customers are willing to pay for your opinion. Online surveys won’t make you rich, and won’t allow you to quit your day job, but you can make a little extra cash. When choosing between surveys, read the fine print. There is usually an asterisk near the "you won" part. This means you have to do something like buying stuff before you even get to talk about your prize. Don't fall into these sorts of traps, they're ridiculously difficult and not worth it. In general, the more companies you sign up with, the more survey requests you’ll receive in your email and more opportunity you’ll have to make money.