A good way to make extra money is to find something that you can do easily and then advertise it either online, in print, or by word of mouth. There are many, many opportunities right now to make extra money by joining a network marketing company and working that part time, using your contacts at work to spread the word about the product(s) that you represent, or tell friends and family members about it. Some of the products these network marketing companies have are first class, and not available except through these companies.
Another easy way to make extra money is to sell items at online auctions. Many people make hundreds of extra dollars a month this way, and it is a good way to get rid of excess household items that have value to others. Kids can make extra money by walking their neighbors' dogs, or cleaning up after pets in their back or front yards. It is not difficult to make extra money once you have identified an income source that works for you in your spare time.