I want to do everything that is written here
Make sure your 404 template works
Please note that only the steps of FlatpageFallbackMiddleware at one time another view successfully generated a 404 response. If another view or intermediate class. produce 404, but end up with an exception (for example, a TemplateDoesNotExist exception if your site does not have an appropriate template for HTTP 404 responses), the response will be HTTP 500 ("Internal server error") and FlatpageFallbackMiddleware will not attempt to serve the flat page.
Can someone tell me what I need to do to create a 404 template
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