This is the official curriculum of the Apple High Sierra 101: OS X Support Essentials 10.13 course and preparation for Apple Certified Support Professional (ACSP) 10.13 certification—as well as a top-notch primer for anyone who needs to support, troubleshoot, or optimize macOS High Sierra. This guide provides comprehensive coverage of High Sierra and is part of the Apple Pro Training series—the only Apple-certified books on the market.