When you post any article and you want to show your post thumbnail on single post’s img tag. So paste simple code where you want to show thumbnail’s image.
How to Do
Simply paste get_the_post_thumbnail_url() php code, if you want to show only thumbnail url. Otherwise add this code on img tag for showing thumbnail.
Example for showing only thumbnail’s URL
<?php echo esc_url(get_the_post_thumbnail_url()) ?>
Example for showing Image
<img class="entry-image" src="<?php echo esc_url(get_the_post_thumbnail_url()) ?>" />
Hope you know that how to show image thumbnail’s URL or show Thumbnail using IMG tag.