In each theme you can edit the primary links that are the navigation pointers for visitors on your site. You can edit the primary links for your theme from Administer Site building Menus. You can add as many menu items as your theme allows you to display. You can control the order of a menu items on your list by altering the assigned weight. Menu items with -10 will move to the left and +10 move to the far right. The path variable controls the location or URL a person is directed to when a specific menu item is clicked. The content you create with specific URL name can be listed here to create a link or navigation pointer to the main items your site is about.
In this video you will see how to create a primary menu and connect URLs (paths) to it.