좋은건 크게보라고 선생님이 가르쳐 줬어 => 좋은 건 크게 보라고 선생님이 가르쳐 줬어. The direct translation may be "Our teacher taught us to see good things bigger", but to me, it doesn't sound quite natural in both languages. I don't think people commonly use "크게 보다" in this way. The intended meaning is probably "Our teacher taught us to pay more attention to good things", or perhaps "to take in good things amplified".

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I am native korean, but i don't understand that the post say. Forget it.i think that it's just sort of personal expression. If i would've seen the whole paragraph, i could explain that. You can forget it by the way.