Current Time: CRTL+SHIFT+;
Current Date: CRTL+;
Total sum of a colum: ALT+=
Select entrire row: SHIFT+space
Select entrire column: CRTL+space
Hide column: CRTL+0
Hide Row: CRTL+9
Show/Hide formula: CRTL+~
New line in a cell: ALT+ENTER
Current Time: CRTL+SHIFT+;
Current Date: CRTL+;
Total sum of a colum: ALT+=
Select entrire row: SHIFT+space
Select entrire column: CRTL+space
Hide column: CRTL+0
Hide Row: CRTL+9
Show/Hide formula: CRTL+~
New line in a cell: ALT+ENTER