The document provides guidance on writing effective commentary for AP level essays. It emphasizes including commentary, which involves analysis, interpretation, and opinion, rather than just reporting facts or details. An effective ratio is at least two points of commentary for every one point of concrete detail. The document offers examples to illustrate the difference between concrete details and commentary. It also provides tips for getting started with commentary, such as using phrases like "This shows that..." to help structure thoughts. Practice and adherence to the outlined ratios are important for mastering commentary skills.