No computer provides a trouble-free experience. This handy guide walks you through ways to diagnose, fix, and prevent the most common Mac hardware, software, and operating system problems. You'll learn how to handle problems confidently by using a systematic, iterative process and an array of built-in tools. 1. Getting Started 2. Using Startup Commands 3. Resetting the SMC 4. Resetting NVRAM 5. Starting in Safe Mode or Verbose Mode 6. Using macOS Recovery 7. Network Settings and Diagnostics 8. Resetting Network Settings 9. More Network Tricks 10. Slow Computers 11. Permissions Problems 12. Errant System Preferences 13. Exploring macOS's Libraries 14. Finding Solutions on the Web Diane Yee is a technical writer in Sunnyvale, California.