When building projects with Next.js, we typically create an entire user interface by assembling isolated components. However, some parts of the interface require the same code snippets across multiple routes - for example, the navigation header, footer, and sidebar.
Next.js recommends starting a new project with the App Router. However, in this tutorial, we'll also discuss how to implement layouts and nested layouts with the Pages Router for users who have yet to migrate to the new Next.js routing system.
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