Learn what "i don't know what you know about it" means, when people say it, and how to use it naturally in English.

It means the speaker is unsure what information the other person already has.
From Why I Did It, Episode 12
The speaker is saying they do not know how much the other person understands.
Use this when you need to explain something but don't know the listener's background. It can sound evasive if used to avoid answering directly.
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