HTML Boilerplate
Watch our course on HTML in order to get a good grasp on how HTML works and best practices. HTML is relatively simple to learn, so you'll get the hang of it quickly.
wp-content/themes/customtheme/index.php
<!doctype html>
<html>
<head>
<title>Custom Theme Title</title>
</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; ?>
</body>
</html>