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useEffect: The useEffect hook in Next.js manages side effects in functional components, such as data fetching and event listeners, by executing code after renders and providing cleanup mechanisms to prevent memory leaks. By utilizing the dependency array, developers can precisely control when these effects are triggered, optimizing performance and preventing unintended behavior.

This shows supports for posts in nested sub-folders. This can be used to group posts of similar content e.g. a multi-part course. This post is itself an example of a nested route!