Probably the Ctrl + C and Ctrl + V are the universal shortcut keys everyone knows. In all the software’s use of copy and paste, methods are invaluable.
Excel fill down is an option when we want to fill down or copy any data or formulas to the cells down below, we can use the keyboard shortcut which is CTRL + D while copying the data and selecting the cells or we can click the fill button in the Home tab and use the option for fill down from the list.