Back in the nineties and early two-thousands, if you wanted to build a website, you had to learn how to program HTML. HTML is a special language that tells your browser what a website looks like.
In it’s most simple and generalized form, affiliate marketing is the process of taking an item or a service and advertising it to your audience. Simple, right? Well, not quite.

Using a search engine like Google, search for “affiliate program” + [product name], or simply email the merchant and ask. You’ve previewed the product so you know its quality (given, in this case). They have a solid refund policy that you trust they’ll honor. They provide good customer support (and you’ve tested it). You have a good story to share about your experience with the product. The offer fits your audience’s needs and won’t abuse the trust you’ve built with them.
Move that comparison chart a little bit higher. Move the first “Buy Now” button a little bit lower on the page. See what happens. The small amounts you lose out on here or there don’t compare to discovering that a few small changes will literally increase your income by 20%, 50%, or more.