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Lesson 2, “Objects in Objective-C,” focuses on the object-oriented parts of Objective-C. Viewers learn how to implement classes and objects and how to use these tools to create code that is modular and reusable. The video discusses how classes and objects work in Objective-C and how Objective-C implements inheritance and polymorphism. Viewers learn how to create objects in code. Lesson 2 finishes by having viewers learn how to declare their own classes, including how to write class methods and object methods to use in their own code.