OneSearch, the all-in-one search of articles, books, and more, is a great place to start. A search in OneSearch can tell you if you have a topic that is too broad or too narrow, or if you need to refine your search terms to get better results.
OneSearch searches many of the Libraries' more than 400 research databases, and can be used to find both scholarly and popular articles.
Once you've entered a search term, you can narrow your results to articles from peer-reviewed journals by clicking the Availability: Peer-Reviewed limiter in the left hand menu: