Chapter 6 is officially over with this lecture. In this lecture, we tie up some loose ends to complete the application we promised in the beginning of the chapter. As we do that, we will practice more "linker" objects. In my perspective, link objects are the most powerful feature in programming that hide inside of them a plethora of complexities that simplify our code. There're a few more concepts we haven't learned yet, deeply. The first is conditions, and the second is loops. Try to go back to the samples every time you learn a new concept as it will shed a lot more light onto them.