Giving away a free informational product such as an e-book, an email series or a mini-course is a popular tactic many affiliate marketers use. Usually, your readers will have to provide their email addresses to receive the product from you. You can then use this to sell to them via email marketing. Additionally, an informational product can generate interest in the actual product you're trying to sell. If your product is popular enough and brings enough traffic to your site, you could also monetize the traffic in other ways, such as AdSense.
Tara Banda is a brand-builder, copywriter, and social media marketer in Dallas, TX. She has worked with businesses of all sizes — from Fortune 500 companies to local non-profits to startups — to define their voice, promote their brand online through digital marketing, and build lasting relationships with fans and advocates. Tara is a currently a Content Marketing Manager at ReachLocal. In her spare time, she is obsessed with learning recipes for international cuisines. You can learn more about her on LinkedIn or Twitter.