How can use copy content and avoid Google penalty?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Rey Malhotra: how can use copy content and avoid Google penalty
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  Mikita Shah: To avoid content duplication and copy content canocalization has to be used. Canonical tag help you in avoiding content dublication or else Google would penalize. 
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  SEO to Grow - Conceptual Web Designing: +Sana Sattani you could use this information
  Thank you +Mikita Shah for the tip. 
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  Jim Munro: I am not an expert but my question is what is the purpose of putting pages up only to ask googlebot to ignore them? Shouldn't crawl budget also be a consideration? ;