Force Quit an App
You probably won’t need to use this keyboard shortcut all that much, especially if you have a newer Mac. However, it’s important to know how to close an app that’s causing your Mac to slow down and isn’t responding to the usual attempts to close it.
To force quit an app, you first need to press Option + Command + Escape. This will bring up a new window with a list of all the apps running on your Mac. Next, select the app you want to close and click Force Quit. Finally, confirm you want to terminate the app by clicking Force Quit one more time.