This Overview of Scholarly, Trade, and Popular Publications will help you understand the key differences between each of these source types.
UK Libraries subscribes to a huge number of article databases. If you're not sure where to start, use a Research Guide for your subject, Ask Us for suggestions, or try Academic Search Complete (search box below), a good general academic database.
It's a good idea to check the box to limit to Peer Reviewed journal articles if you were asked to find peer reviewed/scholarly articles.
Sample search terms for databases:
"college campuses" and "student activities"
crowdsourcing and business
"public spaces" and "social values"
universities and basketball arenas