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    copied!<p>When trying to understand how the templates fit together, the best tool I've found is the <a href="https://drupal.org/project/devel_themer" rel="nofollow">Theme Developer module</a>. It works a little like Firebug and allows you click on areas of a page to see the theme functions or template files that are used for various parts of the page, along with the "<a href="http://drupal.org/node/190815" rel="nofollow">suggestions</a>" that can be used for <a href="http://drupal.org/node/173880" rel="nofollow">overriding</a> them.</p> <p>Templates can fit together in a variety of ways. Drupal does make some assumptions about how they'll be nested, which are reflected in the default variables that are available in the templates files. However, both the <a href="http://drupal.org/node/223440" rel="nofollow">template suggestions</a> and the <a href="http://drupal.org/node/223430" rel="nofollow">available variables within them</a> can be modified.</p> <p><strike>As I understand it, <a href="http://api.drupal.org/api/drupal/modules--system--page.tpl.php/6" rel="nofollow">page.tpl.php</a> has been replaced by <a href="http://api.drupal.org/api/drupal/modules--system--html.tpl.php/7" rel="nofollow">html.tpl.php</a> in Drupal 7.</strike></p> <p>The best description I've heard for "Blocks" is that they're what you use to display content that will be re-used in various areas site. The most common use is for sidebars, such as "Recently updated pages" lists or "Who is online now" lists.</p>
 

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