Today we will be looking at Alt + F4, Alt + F6, Ctrl + Alt + Delete

Alt+F4 is a keyboard shortcut often used to close the currently-active window. For example, if you pressed the keyboard shortcut now while reading this page on your computer browser, it would close the browser window and all open tabs. More specifically, the Alt + F6 hotkey is for switching among top-level windows in an application. For example, start Notepad, type some text, and then press Ctrl + F to call up the search dialog. At this point, you can use Alt + F6 to switch between the search dialog and the main Notepad window. and finally Control+Alt+Delete is the combination of the Ctrl key, the Alt key and Del key that a user can press at the same time to terminate an application task or to reboot the operating system.