One of the most frequent questions I get asked is in the choice of keywords for a new site, specifically secondary keywords.. These are the words or phrases that you use when writing your content to help theme the page so that the search engines know what your page is about. These secondary keywords also help to bring in more traffic, because they add more depth to your page, meaning that your page is found for a lot more phrases than just the primary phrase you page is built around.Let's look.