When I refer to core content, I am referring to the content displayed in the main content area of a page (as shown in the simple wireframe to the right).
In Drupal, the content area of the page typically displays a node but it could also display items such as
Thank you for your interest. I apologize for any inconvenience this limited access causes. This online guide is now a book called Drupal: The Guide to Planning and Building Websites. The content of the guide is being updated, expanded, and edited. It will include tips for D6 and D7. I hope you will find it useful.