If you want to do that, I recommend starting by watching Paul Irish's "10 Things I Learned from the jQuery Source" [0] and "11 More Things I Learned from the jQuery Source" [1] as he does exactly that.

There's also jQuery Deconstructed [2] to navigate the jQuery source in... an interesting manner.

[0] http://paulirish.com/2010/10-things-i-learned-from-the-jquer...

[1] http://paulirish.com/2011/11-more-things-i-learned-from-the-...

[2] http://www.keyframesandcode.com/resources/javascript/deconst...