Making ebook covers is a relatively new task for designers and there haven’t exactly been many lengthy discussions on the topic. If there were any lengthy discussions I completely missed them which is entirely unsurprising. (I was probably too busy watching videos on Youtube of dogs running into walls and cats falling off furniture.)
I didn’t think of googling “how to make an ebook cover” until last week and my first advice is don’t buy a book about designing ebook covers if the book in question has an ugly cover. It’s just good sense. Otherwise googling ebook covers is good fun and I highly recommend it.