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Hey, a warm welcome to day 43.

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Today you're going to learn some advanced concepts about classes and object oriented programming.

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Plus, I'll make sure that you understand all the terms you have learned so far, such as attributes,

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methods, instance variables.

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So we have covered this, but I'm sure that there is still some sort of uncertainty on your parts.

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You still don't know what is the instance variable, what is a method, and so on.

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Specifically, what you learn today is instance variables versus class variables.

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You'll know the difference in SAS methods versus class methods.

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You will learn to use properties, class properties.

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You learn static methods, magic methods, abstract classes, and abstract methods.

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And that's all you need to know about classes.

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So don't miss the videos of today and I'll talk to you in the next one.