There are a lot of myths about duplicate content in SEO. One of them being that copying an article from another site will hurt your ranking. Actually, this is not completely true. You can visit Google’s guidelines about duplicate content. There, it states that putting duplicate content in your site is good, as long as you don’t do it to manipulate the search ranking. This means that if you want to add content from another site with an innocent goal to inform people, you are doing nothing wrong. But on the other hand, if you are constantly copy pasting or spinning stuff and trying to get good SERPs through it, your site will face penalties.