I was using webceo and came across pages that are blank. They of course have a URL, but no content.
So how do I know whether they should be noindexed (because they serve for functionality purposes) or if I should just delete them?
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It is never a good idea to have blank pages with no content publicly accessible. Best practice is to remove the pages until such time as you have content for the pages, but as you state they are for functionality purposes only and so would never need to have content. In this case absolutely you can add noindex to the pages so that they don't count towards your SERP ranking in a negative way.