Ctrl+A Select all items in a document or window
Ctrl+C (or Ctrl+Insert) Copy the selected item
Ctrl+D (or Delete) Delete the selected item and move it to the Recycle Bin
Ctrl+R (or F5) Refresh the active window
Ctrl+V (or Shift+Insert) Paste the selected item
Ctrl+X Cut the selected item
Ctrl+Y Redo an action
Ctrl+Z Undo an action