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Lesson 7, “Objective-C Best Practices,” covers ideas that will help viewers to write code that is cleaner and more flexible. First, the lesson covers the changes that Objective-C has gone through in the last few years and, as a result, how the code developers write can be cleaner and clearer. Next, viewers learn how to best encapsulate their data in classes. Viewers then learn how to properly use properties and dot notation. Finally, viewers learn how to prevent non-ARC code from using your ARC code.