Another example of a common SEO mistake that you should endeavor to avoid is poor site architecture. Site architecture is the skeleton of your website: it is the design and navigational framework that dictates the flow of both the user behavior and search engine spider behavior on your site. Site architecture needs to be considered at the planning stages of your website. Effective site architecture should display a visible and comprehensible navigational structure to both the users and search spiders, that echoes your content hierarchy. Sound site architecture will yield thorough search engine spidering, engaged visitors, and higher PageRank flow to your primary pages. Poor site architecture can mean that search engines can't crawl your site effectively, and users can't find what they need to convert into customers.

Many SEO professionals will concede that website architecture is one of the most difficult SEO skills to master. Site architecture demands that a webmaster...