Where does one start when trying to cover ``everything else which might be of use''?
I will start with some more properties that one or more of the various shells may bring you. While more GUI tools are becoming available, and most users are familiar with the point and click (or point and double click) interface, it is still true that a command line is much more powerful than a GUI.
What other things will be covered here? Well, there a bunch of other commands which might be of use.