Ask YC: Learning to hack...

One of the common pieces of advice given by the hackers on this site to the non-hackers is to "learn how to hack." In the past few weeks, I have come to the realization that I, too, would like to "learn how to hack." Here's the problem: Not having an extensive technical background, this piece of advice seems to be quite vague. With which languages should one start in order to learn to hack? I sent a similar version of this question to PG about a month back and he referred me to the creators of Appjet, a YC startup he said was working on this very problem. After looking at the site and receiving an email from one of the founders, the answer I gleaned was to start with learning Javascript. I would like to know from this community whether I'm on the right track to "learning to hack."