Hey there, The problems are definitely a bit more advanced. I do try to make sure that any "vocab words" (data structures, algorithm types) can be clicked on f

Hey there, The problems are definitely a bit more advanced. I do try to make sure that any "vocab words" (data structures, algorithm types) can be clicked on for a deeper explanation. But if you haven't seen big-o before, for example, you'll be in the dark on a few things right now. I have some more "bottom-up" curriculum that I've developed from teaching at boot camps around San Francisco, and I'm still working on figuring out the best way to present it on the site. For Big-o specifically (the thing that looks like "O(n)"), I really like these resources: http://stackoverflow.com/questions/487258/plain-english-explanation-of-big-o/487278#487278 http://stackoverflow.com/questions/487258/plain-english-expl... http://www.perlmonks.org/?node_id=227909 http://www.perlmonks.org/?node_id=227909 http://www.daveperrett.com/articles/2010/12/07/comp-sci-101-big-o-notation/ http://www.daveperrett.com/articles/2010/12/07/comp-sci-101-... Best of luck!