A particularly useful research tool is Google Scholar. Google Scholar is especially helpful if you know the name of an article you'd like to find or if you have one very relevant article and you'd like to find more; just copy and paste the article name into the Google Scholar search bar.
From there you should see the original article (if available); you can also select Cited By to get a list of all other articles that have referenced this article or select Related Articles to find articles on similar topics. Articles can be accessed by clicking the links on the right.