The document discusses how to categorize websites based on their quality and level of trust from Google. It proposes breaking sites into groups based on trust and examining the relationship between the number of referring domains, rankings, and traffic. The core hypotheses are that highly trusted sites see a direct correlation between links/referrals and rankings, while less trusted sites may get many links without helping rankings. Redirects are also noted to strongly impact rankings. The document explores how to identify trusted domains and actions to improve trust, as well as correlations between trust, keyword coverage, and costs.