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

It means the speaker made a bold choice and is explaining that the result was uncertain.
From The Pendleton Secrete, Episode 12
Someone justifies a risky choice after it did not turn out as expected.
This is useful when you want to explain a risky decision or defend a choice that did not go perfectly. It sounds natural in conversation, but the full sentence is more explanatory than reusable as a stand-alone phrase.
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