One of the most important selling points of WordPress is the idea of themes. A single theme adds great value to the design and functionality of the website. However, there are websites that have different designs on different pages.
template.php ( you can give any name ):
<?php
// Template Name: my custom template
?>
<header>
<?php
get_header();
?>
</header>
<div class="card">
<?php
if ( have_posts() ) : while( have_posts() ) : the_post(); ?>
<h1>
<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
</h1>
<a href="<?php the_permalink(); ?>">
<?php the_post_thumbnail( 'thumbnail' ); ?>
</a>
<p><?php the_excerpt(); ?></p>
<?php endwhile; endif;
?>
</div>
<footer>
<?php
get_footer();
?>
</footer>
