Summary

macos provides a GUI and Unix core. Remember: use finder for files, terminal for command_line tasks, and spotlight to launch apps. The default shell is zsh_shell. Manage packages with homebrew. Install tools with xcode_command_line_tools. Key paths include /Applications, ~/Library, and /usr/local. Permissions and sudo control access. Security uses gatekeeper and app_notarization. Apps ship as app_bundle, dmg, or pkg. Services load with launchd via plist files. Check performance with activity_monitor.