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So you can set metadata

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in your NextJS applications

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by either setting static metadata

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with help of the metadata constant

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or variable that's exported,

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or by dynamically setting metadata

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with help of the generateMetadata function

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that's exported by your page.js file.

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You cannot just set metadata in page.js files though,

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instead you can also set it in the layout.js files.

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And indeed, there you should already have a metadata object

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that's being exported in the root layout here

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in that project I provided to you.

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And the idea behind setting up metadata in layouts

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is that this metadata will now be used for all the pages

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that don't set their own metadata,

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or to be precise,

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the metadata you set up in your layout will be merged

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with any metadata set up by a page.

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And if a page doesn't set up any metadata at all,

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it's this entire metadata object that will be used

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for this specific page.

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But if you had a page that just sets a title

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and not a description,

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the page title would override the layout metadata title,

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but the layout metadata description would be merged

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with the page specific title.

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And therefore setting up metadata in layouts

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can be useful for ensuring

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that there is at least some metadata in all your pages,

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but you can then still override it

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from inside some of your specific pages.