I was just curious to see if anyone used a sub heading or a secondary title on their book cover to help with search engine optimization? I was told it was extremely important but can't seem to find a lot of information in regards to it.
This is something that I have never heard of or done but maybe I will look into this.
The purpose of a subtitle is to explain the title to the buyer in any format. Now that most books are purchased online, it should include keywords that your buyers are likely to search for.