Working in a schedule you can find yourself tempted to use the mouse, move back to the keyboard, back to the mouse...so on.
If you navigate a schedule using the arrow keys or tab as opposed to picking a field with the mouse:
HOME = activates edit mode and places cursor in front of the data
END = activates edit mode and places cursor at the end of the data
SPACE = activates edit mode erases the data and moves over one space
You can navigate a schedule pretty easily and not have to use the mouse doing so using a combination of the above.
One very effective use for HOME: Let's say you have GWB entered in a column many times but you want it to be PT GWB instead. Put the PT in one field, then copy "PT" to the clipboard, then use the UP/DN arrow keys to navigate to a field, press HOME and CTRL+V to paste in the value. This way you can "play" drums on your keyboard and enter a bunch of data pretty quick. (no quips from Steve "Rock-n-Roll" Shell thank you!)