We're making good progress in our study of ActionScript fundamentals. If you've read and understood the concept in the past 12 chapters, you now have enough knowledge of ActionScript to start learning about most Flash client runtime APIs. So it's time to choose your own adventure. If you want to continue exploring ActionScript's core features, head on to Chapter 13, where we'll learn to write code that recovers from runtime error conditions. If, on the other hand, you'd prefer to learn how to use ActionScript to display content on screen, then skip ahead to Part II.