Do you know how to make money on Craigslist? Craigslist is the world’s largest and best classified site. And the best part is that almost all of the classified ads on Craigslist are free.

Craigslist started out as a simple email list that Craig Newmark sent to friends in the San Francisco bay area. At first it was a list of the weekend’s parties and events. As his personal list of recipients grew, people began asking him to list a roommate vacancy or a job opening.

Eventually, he decided to put the list online and let anyone post to it. The site was initially for San Francisco area users, but in 2000, they set up separate listings for Boston, Chicago, Los Angeles, New York, Portland (OR), San Diego, Seattle, Washington DC, and Sacramento.