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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Codepoint, buffer code, and file code.
Date: Thu, 08 Jul 2021 09:38:44 +0300
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 (message from Hongyi Zhao on Thu, 8 Jul 2021 08:27:30 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Thu, 8 Jul 2021 08:27:30 +0800
> 
> What difference does code point, buffer code, and file code mean, and
> what's the relationship among them?

Did you read the doc string this command and the documentation it
refers to?  If so, please ask specific questions about that, because
AFAICT the doc string answers all of your questions.