(marketing) or (auth), Next.js will not include (marketing) or (auth) in the URL—it’s just an organizational tool to group certain routes or apply layouts without changing the URL structure.Ref - https://github.com/code100x/cms/tree/main/src/app/(marketing)
Create a signup and signin page in a nextjs app where both of the pages are wrapped in a layout, but no other pages are.
The website supports three pages

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You cant keep all the routes at the same level. If you do, the layout will be applied to the user page as well. Hence the route groups
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