Great article as always. As far as finding the right keyword phrases, what I’ve always been unsure of is where and how often do we use these keywords? In your example, “sleeping bags under $100,” would I place that in my post titles and/ or content? How often is ideal to still make it look natural? Could I use that keyword phrase again on other articles/ reviews? Thanks for what you do.
I guess the only thing I’d say about this is if you are blogging in a competitive niche and working in what I’d call the “gray area” of link masking and not using “nofollow” as described here by google (https://support.google.com/webmasters/answer/96569?hl=en) expect that competitors that are writing real reviews with real photos (not stuff grabbed from a manufacturers website) are going to report you to google as webspam. The thing I hate most is affiliate sites that have never held a product in their hand and then try to pass off something as a first person review for the sole sake of pushing you to Amazon.com.
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Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.