1)Write for your Readers, not the Search Engine
2)No matter what you do on your site, always do it with your visitors in mind first.
3)Do not focus on Keyword Density
4)Google is much more interested in the associated terms you are using
5)Do use Related and Suggested Search Terms
5)Use Heading Tags
6)content title enclosed in a <h1> tag
7)each sub-section of your content should titled with a <h2> tag
8)doing this will facilitate the crawling and understanding for the search engines