In this video — you will learn how to add navigation support to your WordPress theme by registering your menu within functions.php.
NOTE: I made a mistake at 4:20 where I placed the menu above the body tag. You do not want to do this — make sure that your menu exists within the body tag.
The WordPress nav system is a powerful core feature that allows admins and content authors to manage navigation menus while allowing you as the developer to support one or more menus throughout your theme.
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WordPress Docs - Navigation Menus
https://codex.wordpress.org/Navigatio...
WordPress Docs - wp_nav_menu()
https://developer.wordpress.org/refer...