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add_action( 'wp_enqueue_scripts', function() {
    // Register Stylesheets and Scripts in here
    // @link https://developer.wordpress.org/reference/functions/wp_enqueue_script/
} );

<!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
    <?php wp_head(); ?>
</head>

<?php get_header(); ?>
<body <?php body_class(); ?>>
    <!-- Markup from your HTML files -->
    <?php get_footer(); ?>
</body>

<?php /** Template Name: About Us */ ?>