Wordpress WP_Query example

gistfile1.php

<ul class="none">
<?php $lessons_query = new WP_Query( array('post_type' => 'lesson', 'cat' => 21,'orderby' => date, 'order' => DESC, 'posts_per_page' => 5));
while ( $lessons_query->have_posts() ) : $lessons_query->the_post(); ?>
	<li>
		<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
	</li>
<?php endwhile;	wp_reset_postdata(); ?>
</ul>