Display last featured image from a category

You need this code:

// The Query
$the_query = new WP_Query( 'cat=5' );

// The Loop
while ( $the_query->have_posts() ) : $the_query->the_post();
	if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
		the_post_thumbnail();
	}
endwhile;

// Reset Post Data
wp_reset_postdata();

References:

https://codex.www.ads-software.com/Class_Reference/WP_Query
https://codex.www.ads-software.com/Function_Reference/the_post_thumbnail

blogjunkie,Thanks for such a quick reply. Where would I put this? I was thinking of just putting it in a margin using a blank text widget.

You need a widget that can execute PHP code. Try searching for it in the plugin directory. Or, put the code directly into your sidebar template file. Good luck

Ok I got it to work. At first it displayed all records. Now i got:

$the_query = new WP_Query( ‘cat=5&posts_per_page=1’ );