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Now with the core basic set, now that you know how you can basically insert data, read data and so on

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and that you also saw how you can explore your data,

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let's take a step back and start at the basis or the start of any project

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and there you'll have to decide how you model your data,

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how do you plan to store your data in the database, which relations exist between your data and how should

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these relations be reflected in your database?

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These are all important questions and these questions will impact how you use mongodb and how you

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structure your data there.

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Therefore in this module, we'll have a look at document schemas and understand what's up with these

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and how you can create documents schemas or define documents schemas and we'll also have a look at the

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important data types

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mongodb offers to you because data types like texts, numbers but also some advanced types

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like dates and so on are of course crucial to enable you to store exactly the data your application

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or your use case needs. We'll not stop at these data types in the general document schema though, we'll

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also have a look at relations between documents or your data because in most applications, you got

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different entities, things like let's say when you're building a blog, you have posts, you have users

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you have comments and all these entities are related and these relations need to be reflected in your

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database too

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and you will see how that works in mongodb in this module too.

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And last but not least, having an idea of how your data should look like is nice but you also want to

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validate incoming data, so all your inserts and updates, you want to validate whether the data getting

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written there fulfills your requirements,

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so for example if that age of a user really is a number. And you will learn how you can perform schema

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validation in this module too therefore.