To loop a video on a Mac using the default media player, QuickTime, follow these steps: Open QuickTime by clicking on the QuickTime icon in your Dock or by searching for it using Spotlight. Click on "File" in the menu bar at the top of the screen, then select "Open File" and choose the video you want to loop. Once the video is open, click on "View" in the menu bar and select "Loop" from the...