Get a handle on macOS Catalina It doesn't matter if you're doing your computing on an old reliable Macbook or a brand-new Mac desktop, both rely on macOS to help you get things done. It helps to have an equally reliable guidebook to steer you through the tasks and steps that make macOS run efficiently. This fun and friendly guide provides the direction you need to easily navigate the classic and brand new features in macOS Catalina. Longtime expert Bob "Dr. Mac" LeVitus share