Go to Structure then Menus in the admin interface. Drupal comes with several default menus like Main navigation, Footer, and User account menu. You can add new ones with Add menu.
Add menu items through the Add link form or by checking the Menu settings section when editing a node. Each menu item has a title, URL, parent, and weight for ordering.
To display a menu on the site, place the appropriate menu block in a region through the Block layout page. Menus support nesting, access control, and translation. For complex navigation, contrib modules like Menu Block give you more rendering options. Drupal’s menu system is flexible and handles everything from simple header navigation to large multi level site maps. It is one of the platform’s more polished features for editors.