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In this core section,

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we made a lot of progress

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and we took quite a deep dive

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into express.

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There definitely were more advanced features

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and it was definitely a section

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with some challenging concepts.

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If anything is unclear,

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definitely go through the different lectures again

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because these again, are fundamentals,

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which you should understand.

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Though I will say, that of course we'll

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see them again later

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and we'll practice them again, later

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once we come to our big milestone project,

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the online shop,

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which we are going to build.

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So that will be another great practice step.

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Nonetheless, in this course section,

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you'll learn about dynamic routes,

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a key feature to show detail pages,

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and to encode unique identification criteria

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in your URL.

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And it's a super important feature, which you'll use on

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almost any website you are building.

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And you'll also learn how you can handle errors,

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how you can handle unfound resources,

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so pages which were not found,

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and how you can handle errors

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with this default error-handling middleware, which we added.

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You also learn how you can split your code

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into multiple functions,

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but also into multiple files, and how you can require your

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own files, how that works,

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and that you must require your files in order

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to use features from them.

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And, that in files that hold

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features that should be used in other files,

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you have to export those features with this

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module export syntax.

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You'll also learn about the express router,

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which allows you to split

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your route definitions across

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multiple files,

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and how you can then use this router to still

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merge everything together with that

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middleware use such function, this use method

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on the app here.

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Again, as mentioned,

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we'll see all these concepts over and over

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again throughout the course.

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So there will be plenty of possibilities of exercising this.

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Nonetheless, I hope the core concepts are clear by now

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and we're now ready to advance.