You can use different methods and options to turn off your computer safely and quickly, depending on your operating system and the situation:

• Windows:
  • Use the Power Button in Start
  • Right-Click the Start Button
  • Press Alt-F4
  • Use the Command Line
  • Use the Ctrl+Alt+Delete or Login Screen
    
    ^{2 8 9 10}
• Mac:
  • Click on the Apple icon and select Shut Down
  • Press Control + Option + Command + Power button
  • Close the lid of your MacBook
    
    ^{5 3}
• Linux:
  • Use the shutdown, reboot, halt, or poweroff command with options and messages
    
    ^{6 7}
• Any system:
  • Press and hold the Power button for about 10 seconds until the computer turns off (only if frozen or unresponsive)
    
    ^{2 3 4}

You should also save all your work, close all open applications, allow updates to complete, and eject any external devices before starting the shutdown process to prevent data loss, system damage, or performance issues. ^{1 2 3 4 5}