vsuresh He is really a good cook. He [is really] a good cook ~ It is quite true that he cooks well. ( is really) He is a [really good] cook ~ He cooks very, very well.
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vsureshHe is really a good cook.He [is really] a good cook ~ It is quite true that he cooks well. (is really)
vsureshI think what I guessed is somewhat similar to your explanation.Somewhat, yes. Changing the position of 'really' changes which other word in the sentence you are modifying — or 'emphasizing', if you want to put it that way.