A strong, well-written research paper will acknowledge and consider the opposing viewpoint, and then go on to refute that position. So, for example, if you are arguing in favor of something, you want to find an article that argues against that same thing. Discuss this opposing viewpoint in your paper, and then discuss why that view point is wrong.
These databases include many types of articles: scholarly, academic, and popular.
Choose the " limit to peer review" or " limit to academic journals" to excluded popular magazines and newspapers from the results.
Be sure to also choose "limit to full to full-text" so you only get results that will let you access the full article.