The motivation to build this plugin came from my users who had issues trying to use WP Gallery Custom Links. I realized that this plugin was working extremely well with the standard gallery, but would require too much rewriting for Gutenberg and other galleries, hence the creation of this plugin. I hope it will help.
How to Link an Image to Any URL in WordPress
Images always link to their attachment page by default. This is pretty much pointless because the attachment page just displays the same image, and usually not even at a larger size!
How to Add Custom Image Sizes in WordPress (Step-by-Step)
This is very cool. One question I have is if I add the extra image sizes as you suggest in step 2, will this then allow WordPress to choose which size to display based on screen resolution? If the site is responsive then the image size required would surely change for mobile, tablet and desktop. Apologies if this is too noob!
How to Link a Photo to a Website in WordPress