hello /g/

installed ubuntu 11.04 today, first time linux user. I like it, but could anyone help me with a couple of things.

First, what apps should I install
Second, what are some basic terminal commands and what do they do (like "sudo apt get")
thirdly, acciently installed dektop version, how do I change to laptop version (can I install battey drivers or do I need to reinstall)

anything else I should know?


tl;dr first time linux tips