This is by no means an extensive list, and I am very new to Ubuntu, my exposure to Linux is from a Server background with CLI only. Anyhow, this is what I have learnt so far..
During my repeated installs of Ubuntu, I have found a number of very useful keyboard shortcuts when using the Unity GUI:
|CTRL+ ALT+T||Launch a Terminal Window from inside the GUI|
Basic Linux Commands
|ifconfig||Display the current IP address assigned to the network|