You know this one already. You include links to products you are promoting as an affiliate and every time somebody buys the product, you get a commission. With a blog, you can integrate advertising with content to make it even more likely you’ll get the sale. For example, you could do a product review—which is useful content—and then include a link to buy the product under an affiliate link.
Raise your hand if you love the idea of earning extra income or ditching office life to learn how to make money at home. Well, you're not alone. According to a 2017 telecommuting report by FlexJobs, the number of U.S. employees who worked from home at least half of the time has grown 115% in twelve years, from 1.8 million employees in 2005 to 3.9 million in 2017.