Buy and sell is the basic marketing approach people are fond of using to earn extra income in their day to day life. This technique is very common knowledge to all people in all walks of life. But “buy and sell” doesn’t only mean that you need to buy a new item then sell it back to prospected customers. This can also be applied to “old” or “used items” that you don’t intend to use anymore, you can turn them into cash by selling it on “buy and sell” websites. You can also use online auction sites to sell antique items you have. I will not elaborate on this further because this is self explanatory. You just need to sign-up a free account on the “buy and sell” websites to get started with.