As mentioned, it's a vast field. It would help if you gave us some idea of where you're starting from and what the course is about. Complete beginner? Learning to program? What language? Learning systems administration? What OS? Something else entirely?
I am far from being a geek, but I learnt basic command line (DOS - back in the day) from my dad, then the basics of programming (in Pascal - ugh) in a structured course at uni, and all the rest (Fortran, Matlab, unix, s/x/html) just on the job as needed. If I need to look something up, I usually just google it, but I find the O'Reilly books great references.
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