Adding a featured image for each post is important for your website’s beauty & very much for the SEO part. To make sure all posts have a featured image, use this code to add a thumbnail of the image to the post list in your wp-admin:
This snippet is one of the most useful I’ve ever used. It allows you to fully customize the shown columns in the posts screen, whether it’s a regular ‘post’ type or a custom one. Adding a new column Step 1/2 – add the column to the column list & set its label Line 1: manage_post_posts_columns = […]