Ctrl + Z is the default undo command and Ctrl + Y is redo. Here are a few others from the top of my memory:
Ctrl + Q = Quit
Ctrl + W = Close window
Ctrl + O = Open
Ctrl + P = Print
Ctrl + A = Select all
Ctrl + S = Save
Ctrl + X = Cut
Ctrl + C = Copy
Ctrl + V = Paste
Ctrl + N = New
Ctrl + C
F8
Press the windows key.
Ctrl + V
Windows Key + Tab
crtl-c
Windows key or Ctrl + Esc
ALT+TAB
The windows flag, on the bottom lower left side
Shift - F10
CTRL+S for most Windows-standard programs.
Windows logo key + E