You can use Gale's Opposing Viewpoints database to explore topics and find articles that take a variety of perspectives on thousands of issues.
CREDO Reference is great for background information: definitions, history, biography, and contextual articles written by experts.
There's no easy way to point a library database search to articles that are opinion-based, or that specifically argue for a certain point of view or recommended action. Instead, we recommend students seek these out on the open web. Here are some librarian-approved places to start your search:
Arts & Letters Daily. Their essays and opinions section features a bunch of articles, some more argumentative than others, on art, literature, politics, and philosophy.
ProCon.org. A Nonpartisan website that covers for and against arguments about timely issues (think cancel culture, student debt, pit bull bans, etc.). This is an excellent resource for research paper topics, but it also links to opinionated sources that are the basis for the site's pro-con articles.
New York Times Opinion. International in scope, many of these op-ed pieces are written by world-renown experts and celebrities. You may hit a paywall on this site. If that happens, you can create an account and get access to some free articles. You can also copy and paste the URL into a private/incognito browser window, though this doesn't always work.
Time Magazine's Ideas. Another mainstream news source, TIME refers to opinion pieces as "Ideas."
All Sides. Here's a site that takes current events and shows how left, center, and right news outlets are reporting it. The side-by-side headlines make it easy to see rhetorical choices and the different ways outlets approach a story.
In a Google search box, type the word opinion and then your keywords. Ex: opinion hurricane climate change
CONTENT WARNING: These sites are not sources of reliable information about the world, and would not be accepted as credible in an academic context. If your instructor/assignment permits, you might use these as examples of extreme rhetoric, misinformation, or political bias.
National Review. I don't see an opinion section, but many of the articles on this site are heavily slanted politically. Look for sarcastic headlines/subheads and judgmental wording (for example, "The president blunders from one self-inflicted crisis to the next.")
The Blaze Op-Eds. Very conservative online media company founded by Glenn Beck. If you're looking for a conspiracy theory to argue against, this is a good place to find one. Some of the content here is very extreme.
HuffPost.com. Liberal-leaning news aggregator. Lots of political content, but you'll also find opinions about sports and culture.
FactCheck.org's Misinformation Directory. They haven't updated this in a few years, but here's a list of sites know to post fake news and misinformation. FactCheck.org posts articles of its own debunking conspiracy theories and rumors, as well as fact-checking public figures.