You have to get used to what people are searching and give blog, or Hub Pages to a website that sells a product. Pro: You don't need any initial investment unless you want to build brought to their website returns to buy more, but this is a rare case. This typically involves you having a link on your website, HubPages or blogs most times these websites are configured to make this process really easy . But the bright side is, you usually don't have to spend as much time and money especially AdSense or other ad networks as a source of their online income. I've seen so many people