R1. Becoming familiar with your computer
The operating system takes care of much of the filing work --storing, moving, and remembering where things are--so you can do useful things at a higher level. You interact with the operating system via a Graphical User Interface (GUI), for example a windowing system using a pointing device like a mouse, or a Command Line Interface, using only a keyboard and a single window.
What are some examples of tasks you'd tell the computer to do via the operating system interface?