20 Incredible Book Covers Non-designers Can Pull Off [With Free Templates] by Claudia Pickering
You have to get a free Canva.com account for the templates but it’s worth a read either way.
Drawing attention to one element cutting through space generates a fantastic sensory reaction from the viewer. It sends one’s imagination into overdrive.
Book Cover Design: How Self Publishers Can Do It Best by Reedsy
At the most basic level, a professional-looking cover will help readers take you and your book seriously. Online retailers like Amazon do not distinguish between traditional and self-published books in their search results. That means independent authors must compete against traditionally published books and ensure their designs match or, if possible, exceed those the big boys are putting out.
They also offer an email course, which I have decided to sign up for.