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That’s a great question @surangasa‌.
I think it’s useful for specific topics that you have trouble with, or a key topic that you’re looking to be really proficient in. I don’t think that the Khan Academy will have ample topic coverage for you to use it as a complete source.
I do agree that many YouTube videos these days are very well edited and maximise your attention and learning as a result. So I’d encourage that as much as possible!