My goodness, what have you gotten yourself into? You thought this book would teach you how to program in Apex, and we just spent a whole chapter telling you what not to do! Worry not dear reader, for knowing what not to do will make you a better Apex coder and help you avoid embarrassment. We can't tell you how many times we've looked at someone else's code and cringed from all the mistakes they made. Besides, this was only the second chapter, stick in there, we're about to get to the good stuff!