wordpress get thumbnail from image code example

Example 1: wordpress get post thumbnail

<?php 
/* RETURNS a full image resource as: <img class="data..." src="data...">
   ALL parameters are optional. Not needed if you are on WP LOOP
*/
echo get_the_post_thumbnail( $the_query->ID, array( 500, 400) ); 
/* USE get_the_post_thumbnail_url() to get only the image url */
?>

Example 2: wordpress thumbnail url

<img src='<?php the_post_thumbnail_url(); ?>'>