This isn't a full-out tutorial, though more of a guide to how I create the maps, so a working knowledge of how Photoshop and projected maps work is assumed. I don't go into details like which exact colours are used and so on as I expect anyone wanting to emulate the style to use their own colours. It's no fun copying things word-for-word :)
Here's a link to a PDF with the exact same guide for anyone who wants a slightly less long version to keep.
Hope you enjoy, and as always, you can check out my Patreon for more images and details of the world. Patrons get exclusive content, like PSDs and high-res JPGs of the maps, as well as textless versions for use in your own work. A more detailed version of this tutorial should be up for patrons later on in the month.