What programming language should I understand to use Ubuntu?

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http://askubuntu.com – I roamed around these forums and look for answers to questions before asking them myself. For example, Skype and how it appears to be online but really it isn't. As I was reading this particular thread I found my self in a lot of talk about what to type into the terminal so it would work. Now as a total newbie when it comes to Linux I want to play it safe and not just copy and paste said solutions into the terminal for a couple of reasons, firstly because I don't know what they mean and lastly because if I do just copy and paste I could be leaving myself open to attacks. Yes, I know Linux is s (HowTos)