Cntrl V = Paste
Cntrl D = Duplicate selected item. (Much quicker.)
Press Select and Cntrl G= Groups items to cut/paste/copy/duplicate together.
Cntrl E = centre justifies text in selected shapes
Cntrl L = left justify
Cntrl R = right justify
While presenting + zooms in your slide - zooms out
B blanks out the current slide
W whites out the current slide