OttoJ the thing represented by the red words 'have to know some fundamentals' sounds all right to me, if you're trying to make a choice. The other two don't fit as well in the style of the passage. You might use 'need' instead of 'have to'.
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OttoJthe thing represented by the red words'have to know some fundamentals' sounds all right to me, if you're trying to make a choice. The other two don't fit as well in the style of the passage. You might use 'need' instead of 'have to'. That would be my choice.