Question: what are all the ctrl functions?
Answer: Ctrl + A: Select all items in a window.
Ctrl + C or Ctrl + Insert: Copy selected or highlighted item (e.g. text, images and so on).
Ctrl + V or Shift + Insert: Paste selected or highlighted item.
Ctrl + X: Cut selected or highlighted item.
Ctrl + Z: Undo previous action.
Ctrl + Y: Redo action.