How do you stop QuickTime?

To stop QuickTime, you can simply close the application by clicking the red "X" button in the upper-left corner of the window or selecting "Quit QuickTime Player" from the QuickTime menu in the top menu bar. Alternatively, you can use the keyboard shortcut Command + Q on a Mac. If QuickTime is unresponsive, you can force quit it by pressing Command + Option + Esc, selecting QuickTime from the list, and clicking "Force Quit."