This chapter lays the groundwork for what comes ahead. You should now have some familiarity with the big picture—with the basic terminology used in Drupal, with the way Drupal presents data at runtime, with the general functions of themes, templating engines and style sheets, and with the location and nature of the key files and directories.
You should also be aware that despite the apparent complexity one sees at first glance, that Drupal themes can be managed in a logical and relatively easy fashion by applying a strategy of intercepting and overriding the theme files.