macOS

1. macOS User Guide

   Everyday use of macOS, the desktop, Dock, menu bar, and apps.

2. Finder and files

   Organizing files and folders, tags, and file management.

3. Spotlight search

   Searching files, apps, and the web from Spotlight.

4. System Settings

   Configuring displays, network, accounts, and other preferences.

5. Users and accounts

   Creating users, administrators, and standard accounts.

6. Time Machine backups

   Backing up and restoring files.

7. FileVault disk encryption

   Encrypting the startup disk and recovery keys.

8. Apple Platform Security

   Secure boot, Gatekeeper, SIP, keychain, and the security architecture.

9. Gatekeeper and runtime protection

   Code signing, notarization, and app launch checks.

10. System Integrity Protection

    Protecting system files and processes from modification.

11. Keychain Access

    Storing passwords, keys, and certificates.

12. Terminal and the shell

    Using the command line, zsh, and shell scripting basics.

13. Disk Utility and APFS

    Managing disks, volumes, and the Apple File System.

14. launchd services

    Daemons and agents, plist job definitions, and starting background services.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date