Some companies prefer to use affiliate networks or platforms. They take care of managing affiliate programs of hundreds of different companies and products under a single website. If you’re accepted into a network, it’s much easier to find additional products to promote and to track your performance in one dashboard.The best affiliate programs I use:
EDIT: As of 13th Feb 2020, Keywords Everywhere is no longer free, you can still use it as it’s quite affordable, but if you’re adamant for a free plan – check out this tool by WhatsMySerp.

The problem with this model was that SEO was going through a weird phase. It used to be we, we would go and build thousands of backlinks to these articles. Ranked them and in return, we get a bunch of free traffic. The free traffic would end up kind of filtering off and going into this affiliate offer. We were generating revenue with no problem at all. What happened was Google came in and said, “All right, you’re using a lot of weird SEO practices, black hat stuff to get these websites, get these pieces of content ranked, so we’re going to DNF the site, not send you any more traffic,”. Then basically squashed the business model.
The tips mentioned above covers the bulk about how profitable affiliate sites are set up nowadays. If you’re familiar with building sites and a bit of SEO, then this affiliate marketing guide should put you on the right path. However, if you want a more comprehensive guide to affiliate marketing, then you will need more than just free resources online to get a website up and running.