However, does it make sense to write an informative article on a topic that people might not specifically search for but might find useful? Say you're running an affiliate site selling "gadgets." Would it make sense to write an article on "The difference between blue and purple gadgets" if no one is specifically using Google to search for that? Or would you write that article, but use your keywords of "buy gadgets online" as the focus keywords and you're explaining the difference between blue and purple gadgets? Or is it a total waste of time?
For some reason I can't wrap my brain around this.