“Why a One-Word Book Title Could Doom Your Sales: The Shocking Truth Revealed!”
Before you give your baby (your book) a name, google the title in quotes AND look it up on Amazon (in quotes). If anybody has a book by that title already, do NOT use it. Customers WILL get confused and they might end up buying that book by mistake. I did that once. Two books had the exact same title and the wrong one came in the mail because I clicked the wrong link on Amazon.
I always recommend having a main title AND a subtitle. That further eliminates confusion, not only for customers, but also for websites’ internal search engines.