A standard installation of Drupal has four initial menus: main menu, management, navigation and user menu. More menus can be added via Drupal's interface, and you can also choose where and how they should be displayed.
There are, in principle, two ways of displaying menus:
- Each menu on the site has its own block, which can be placed in a region just like any block.
- The theme on the site can (but does not always) have two places where menus are displayed in a special format – main links and secondary links. In a standard Drupal installation, the main links are displayed as large white tabs against the blue header, while the secondary links are displayed as discrete links in the upper-right corner of the site.
Which menus should be used for main links and secondary links can be changed at the toolbar's Structure link, in the Menu and Settings tabs.
TIP: The display of main links and secondary links only hold one level of menu links. Submenu items are not shown. It is possible to use secondary links to display subitems of the primary menu by configuring them to fetch links from the same menu. The Menu block module provides further possibilities to display selected levels and parts of a menu.