Explanation
Write down the use of the following shortcut keys:
Cntrl + shift + A is used to change the selected text to all capital letter
Shift + F2 is used to create or edit a cell comment in Microsoft Excel.
Crtl + F4 is used to close the active tab or window
Cntrl + F12 is used to Open a file.
Shift + F12 is used to Save the open document.
Crtl + W is used to Close the currently open document