Nav Menu (category)

has_nav_menu()

Checks if a registered menu location has a menu assigned to it. Conditional tag.

register_nav_menu()

Registers one location (place) for the menu, to which a menu can then be attached in the admin panel.

register_nav_menus()

Registers multiple custom navigation menus locations for a theme, to which the menus are then attached.

wp_nav_menu()

Outputs an custom menu created in the admin-panel: Appearance > Menus.