Yes indeed. Infact I've already known a lot of shortcuts and commands which probably I would never learned with a recent guide
I didn't Know that I can find map drawing tutorial in CS6. I was so happy to know that I could draw maps by myself that I started following the first tutorial I found under my eyes. Probably a more recent one would be better for me, but with a more recent guide I would probably not find you guys
In any case, yes: the "undo" command is my best and more used command, in particularly because I have no graphic tablets, I have to draw everything with my mouse so the result is not always good enough.
I'm thinking to buy a graphic tablet for Christmas, but I've really no idea which models are better or worst so I think that I will buy a low-quality one, just to try drawing with a pen and just to see what's the difference between a pen and a mouse.