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.
The internet is the great equalizer. In business specifically, it has leveled the playing field. Anyone can start a money-making online business—anyone with a computer, that is. But here’s the thing: virtually no technical experience is needed. Today there are plenty of tools you can use to build an online business that makes the technical work a lot easier than it was in the past.