I’m doing my report on Excel then I got a little bored. Experimented on some hot keys and look what I discovered… “Ctrl” shortcut key combinations. 
Ctrl + _ Removes the border of the selected cell/s.
Ctrl + - Displays Delete Row/Column/Cell dialog box
Ctrl + : Enters the current time.
Ctrl + ; Enters the current date.
Ctrl + + Displays Insert dialog box.
Ctrl + 1 Format Cell dialog box.
Ctrl + 2 Applies/removes bold text.
Ctrl + 3 Applies/removes italic text.
Ctrl + 4 Applies/removes underlined text.
Ctrl + 5 Applies/removes strikethrough text.
Ctrl + 6 I don’t know. 
Ctrl + 7 Displays/hides the standard bar.
Ctrl + 8 I don’t know… something about the outline symbols. This is the prompt when I pressed it: Cannot show outline symbols because no outline exists on the active worksheet. Create an outline? Yes No
Ctrl + 9 Hides the selected row/s.
Ctrl + 0 Hides the selected column/s.
Ctrl + G Go To
Ctrl + K Inserts hyperlink
I hope it will help you. Have a good one. 
