An Uber driver's most valuable asset is his car. A photographer's camera is critical. An Uber driver with a broken car can't make money, and a photographer with a cheap camera will slowly starve.What is the critical tool for an author? What tool will help you earn money and keep you from starving?Your laptop!You write, edit, and promote your book on your laptop. A reliable, compatible computer is key to your success. Put another way, an old, unreliable computer is a terrible liability.Investi...