A navigational page is a simple page on your site that displays the structure of your website, and usually consists of a hierarchical listing of the pages on your site. Visitors may visit this page if they are having problems finding pages on your site. While search engines will also visit this page, getting good crawl coverage of the pages on your site, it's mainly aimed at human visitors.
With content marketing, marketers will create content that is likely to rank well for a specific keyword, giving them a higher position and max exposure in the SERPs. They’ll also attempt to build a backlink profile with websites that have a high domain authority. In other words, marketers will try to get websites that Google trusts to link to their content – which will improve the domain authority (and SERP rankings) of their own website.
Another excellent guide is Google’s “Search Engine Optimization Starter Guide.” This is a free PDF download that covers basic tips that Google provides to its own employees on how to get listed. You’ll find it here. Also well worth checking out is Moz’s “Beginner’s Guide To SEO,” which you’ll find here, and the SEO Success Pyramid from Small Business Search Marketing.