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In this extra section,

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I wanna dive into authentication.

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I wanna explore how we can add user authentication,

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signup and signin and logout to a Next.js application.

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In my React course, React: The Complete Guide,

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I do show how to implement authentication with React apps.

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And generally, since a Next app is still a React app,

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it works as shown there, in case you followed that module.

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But in case you didn't, in this module

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I will also explain again how authentication works

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and I will show how Next.js specifically

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can help us with it.

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We are going to learn how authentication works

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in our Next.js application.

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We are then also, of course,

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going to implement authentication.

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We are going to implement users signup and login,

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and we are going to control page access

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to make sure that only authenticated users

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can reach certain pages and can perform certain actions.