This is the official curriculum of the macOS Support Essentials 10.12 course and preparation for Apple Certified Support Professional (ACSP) 10.12 certification-as well as a top-notch primer for anyone who needs to support, troubleshoot, or optimize macOS Sierra. The only Apple-certified book on the market, this guide is designed for support technicians, help desk specialists, and ardent Mac users and takes you deep inside the macOS Sierra operating system.