In many of the posts here I see references to the various templates that need to be changed to implement custom additions such as adsense. Is there any documentation that explains which part of each page or feature is controlled by which template. For instance I see many things refer to postbit, when is postbit run, which action, event or element on the page runs this. I want to have a better understand of the code but I´m seeking the basic structure and interrelations between the templates.