The most useful shortcuts built into your system.
Since I started using the touch-screen HP 2740p tablet, I've found myself tapping buttons in the Office ribbon to run commands - but sometimes keyboard shortcuts are just faster. Ctrl-V is literally ...
Ctrl + M: Enter Mark mode (allows you to select text with mouse). Once Mark mode is enabled, you can use the arrow keys to move the cursor around. Shift + Up or Down: Move cursor up or down one line ...