CTRL + C - will copy text after it has been highlighted.
CTRL + V - will paste text that you have copied.
CRTL + Z - will undo any change that you have done.
CTRL + ESC - will bring up the Start Menu.
SHIFT + F3 - will turn all capitalized text into lowercase.
SHIFT + DELETE - will delete an item without placing it in the Recycle Bin.
ALT + TAB - will bring up a Window with a list of icons representing programs which are currently running on your computer. While holding the ALT key, press and depress the TAB button to cycle between each icon task.
ALT + ESC - will switch to the next task running on your computer. Hold down the ALT before pressing and depressing the ESC key to cycle to the next task.
CTRL + ALT + DELETE - will bring up Task Manager and allow you to end a process (terminate a program) if it has crashed or has stopped responding. Select the process which has stopped responding, and then press "END PROCESS''.
SHIFT + INSERT - will paste any text that is in your clipboard. Your cursor must also be placed in an area that will accept keyboard input for this to work.