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This is a comprehensive, Apple-authorised guide to supporting, optimizing, and troubleshooting macOS Sierra (10.12), the most powerful version of Apple's Mac operating system. It's also the official curriculum for the macOS Support Essentials 10.12 course, and official preparation for Apple Certified Support Professional (ACSP) 10.12 certification.

Through practical, hands-on lessons, students will learn how to set up users, configure system preferences, manage security and permissions, use diagnostic and repair tools, troubleshoot peripheral devices, and more: all they need to professionally support macOS Sierra and systematically prepare for ACSP certification or recertification.

macOS Support Essentials 10.12 - Apple Pro Training Series: Supporting and Troubleshooting macOS Sierra 1/e: Supporting and Troubleshooting macOS Sierra