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<v Instructor>This course section will be about classes</v>

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and objects and about keeping your classes and objects clean

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and working with objects in a clean way.

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Now, therefore, of course,

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it won't matter to you if you are never, ever working

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with classes or objects in your code,

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but if you do work with classes and objects in any way,

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even if that's not a 100% object oriented style,

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then you will get important information

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out of this course section.

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Because we are going to have a closer look at classes

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and objects and we're going to learn

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that we can differentiate between real objects,

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if we wanna call them like this,

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and data structures or data containers

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and what that difference is and why it matters,

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we'll have a look at a bunch of object oriented principles,

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which even help you if you're not following

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a 100% object oriented style.

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We're going to have a look at the solid principles there

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and at the Law of Demeter.

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And we're also going to take another look at polymorphism

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and see how classes can also help us with that.

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It is a concept we already had a look at

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in the last course section.

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Now we're going to take a look in this section.

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Now, this course section we'll still have a couple

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of demos and examples,

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but it will be a bit more theory than the last sections

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because in this section,

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we'll have a couple of core principles and guidelines,

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which you should be aware of when working with classes.