I suggest that when you go on another website and find that their information is really useful, then you should not copy their content. Even if you give the website credit for their work and maybe include a link back to their website, you still should not copy it. Well, why? Because GoogleBotis careful about sites with the same content. GoogleBot will think that you are trying to steal other peoples content in order to get a better search results ranking. It could really hurt your search engine ranking, and maybe even block your site. My advice is to not copy other peoples content.