there's no accounting for taste (expression) used to say how difficult it is to understand why somebody likes somebody/something that you do not like at all:
She thinks he's wonderful-oh well, there's no accounting for taste.
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I'm not sure what you mean by "italicized expression" here -- that term just means something that is printed in italic font.I also think maybe you mean OPPORTUNITY, which is not an idiom.
I really don't know what you mean by Five Kinds ... the word "idiom" simply means a phrase that cannot be understood as spoken because it has come to mean something besides what it appears to mean.