Footer

Here, we add <?php wp_footer(); ?> near the bottom of our index page, so our full page should now look like this:

wp-content/themes/customtheme/index.php

<!doctype html>
<html <?php language_attributes(); ?>>
    <head>
        <meta charset="<?php bloginfo( 'charset' ); ?>" />
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
        <link rel="profile" href="http://gmpg.org/xfn/11" />
        <link rel="pingback" href="<?php bloginfo( 'pingback_url' ); ?>" />
        <?php if ( is_singular() && get_option( 'thread_comments' ) ) wp_enqueue_script( 'comment-reply' ); ?>
        <?php wp_head(); ?>
    </head>
    <body>
        <?php if ( have_posts() ) : ?>
            <?php while ( have_posts() ) : the_post(); ?>
                <h2>A single blog post.</h2>
                <?php the_title(); ?>
                <?php the_content(); ?>
            <?php endwhile; ?>
        <?php endif; ?>
        <?php wp_footer(); ?>
    </body>
</html>