Ctrl + A: Select all items in a window or text and images in a document.
Ctrl + C: Copy the selected item.
Ctrl + D/Delete: Delete the selected item.
Ctrl + Alt + Tab: Switch between all open apps using the arrow keys.
Ctrl + Up arrow: Move the cursor to the beginning of the previous paragraph.
Ctrl + Down arrow: Move the cursor to the beginning of the next paragraph.
Ctrl + Right arrow: Move the cursor to the beginning of the next word.
Ctrl + Left arrow: Move the cursor to the beginning of the previous word.
Ctrl + Esc: Open the Start menu.
Ctrl + F4: Close the active document.
Ctrl + Insert: Copy the selected item.
Ctrl + R: Refresh the active window.
Ctrl + Shift + Arrow key: Select a block of text.
Ctrl + Shift: Switch the keyboard layout when multiple keyboard layouts are available.
Ctrl + Shift + Esc: Open Task Manager.
Ctrl + Shift + M: Restore all minimized windows to full size.
Ctrl + Spacebar: Select an entire column in MS Excel or any other spreadsheet program.
Ctrl + V (or Shift + Insert): Paste the selected item.
Ctrl + Y: Redo an action.
Ctrl + X: Cut the selected item.
Ctrl + Arrow keys + Spacebar: Select multiple individual items in a window or on the desktop.