I want to provide a link to the source of a featured image, that I use to draw attention to a post of mine, to help catalog that as a “fair use”.
Unfortunately, the standard Twentyseventeen theme of WordPress doesn’t offer any way of doing such a simple thing out of the box.
But with the help of my Custom Stuff plugin
(file wordpress/wp-content/plugins/custom-stuff/custom-stuff.php)
that’s only a few lines away
(file wordpress/wp-content/plugins/custom-stuff/featured-image-link.php)
(file wordpress/wp-content/plugins/custom-stuff/custom-stuff.php)