10 Basic Shell Commands Every Beginner Should Know
If you aspire to be a developer, sys-admin, or some other profession that relies on computers outside of word documents and excel spreadsheets then you ought to be comfortable with a command line.
Software and IT professionals love their command-lines as it is much more powerful than any GUI could ever be. This article aims to get you started from no prior knowledge.
If this is completely new material for you, I recommend that you keep a Finder/Windows Explorer/etc.