Modularity provides flexibility but complexity when you aren't used to it.
As stated before, modules are pieces of code that enable Drupal, you, and/or your site visitors to do something in Drupal. Alone, a module can't do much. They work together. They have dependencies.
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.
