//register Menu Here, this will appear on admin under Appearance/Menus
register_nav_menu('custom_menu_location', 'Custom Menu Location');
//Example how functions.php is looking alike
//Function To Inyect <head> Start
function custom_features(){
//register Menu Here, this will appear on admin as well
//Do not forget, so you can build your menus in admin, this registers menu
register_nav_menu('customMenuLocation', 'Custom Nav Menu Location');
register_nav_menu('customFooterLocationOne', 'Custom Footer Menu Location One');
register_nav_menu('customFooterLocationTwo', 'Custom Footer Menu Location Two');
//Inyect Title to <title></title> on <head>
add_theme_support('title-tag');
}
//Trigger Function custom_features()
add_action('after_setup_theme', 'custom_features');
//Inyect <head> End