I mean not FAQ knowledge base or short summary in mobile app, but expanded guidelines with specifying best practices, describing difficult non standard cases, analysis them, and explaining deeply and including explainings which and how every data field should be used/filled.
I found this in the wiki:
The wiki is also collaborative, so if there are missing parts from what you are looking for, I suppose this page could be extended, if relevant.
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You may also find some documentation here: Contributor - Open Food Facts wiki