Firstly, let me say that while my name is Kyle Howard, I am NOT the one that formerly dated Lauren Conrad, star of The Hills. That Kyle Howard shirtless pictured to the left, is not me. He is an actor that has been in a few television shows and has become much more famous for dating Lauren Conrad and then dumping her.
The reason for this seemingly off-topic post is to illustrate a point, which is this: Google looks for certain complementary keywords that go hand-in-hand with your primary keyword. Since the actor with my same name is generally much more famous and searched than I am, my name has basically become a keyword. If, then, that keyword is not accompanied by other keywords which Google has determined to be complementary, the algorithm suspects that my articles are either off-topic or less relevant. So how do you know what keywords are considered most closely related?
I use the Google Keyword Planner, formerly known as the Google Keyword Tool. Going into keyword planner, I search for the exact keyword I want to rank for and search for “Keyword Ideas.” Note here that you will need to click the top tab to navigate away from “Keyword groups,” which are likely to lead you down the wrong path for this purpose.
You will be presented with keyword ideas below. Make sure you are sorting by relevance rather than by number of searches, CPC, etc. Now, in my case I searched for Kyle Howard and got a list of keywords that primarily included my keyword, such as shirtless, movies, height, gay girlfriend, dating, actor, etc. But most prevalent is Lauren Conrad, which was his more famous girlfriend. The fact that my site, which has a ragerank of 1 and has good trust flow is not ranking highly for searches of my name may be because I do not regularly talk about these items which Google has determined are related items to my keyword name. Articles like this one may drastically increase ranking in that regard, but includes non-related information related to my target niche.
Another example might be if you wanted to rank for “upcoming movies.” If you were wanting to rank for this keyword and used the Google Keyword Planner, you might quickly see that you should include terms like “upcoming movie trailers,” “movies in theatres,” and “upcoming superhero movies.” In your articles it may be rather difficult to cram these keywords in, but if it is possible at all to make them feel natural it is imperative that you do it for hard-to-rank keywords.
The moral of the story is that complementary keywords are important and should be added to your posts if you can. Mention related topics and even talk about other topics that are closely related in order to help the computer algorithm realize that your site is relevant and on topic. Remember that even though the robots are very smart, they are not human and occasionally need some help realizing what content is good and important.