It’s a great way to make passive income. Of course, when I say “passive”, this doesn’t account for the time needed to spend building or maintaining your WordPress site. However, in terms of having to promote these affiliate links, you can put in as much or as little work as you want to drive traffic to them. This obviously makes this a great option for a passive income stream if you’re not in the business of e-commerce.

Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income. 
As search engines have become more prominent, some affiliate marketers have shifted from sending e-mail spam to creating automatically generated web pages that often contain product data feeds provided by merchants. The goal of such web pages is to manipulate the relevancy or prominence of resources indexed by a search engine, also known as spamdexing. Each page can be targeted to a different niche market through the use of specific keywords, with the result being a skewed form of search engine optimization.