Scholarly articles are commonly required as part of university-level assignments. This is because scholarly articles are written by scholars or experts and have been approved by other experts in the field through a rigorous review processes such as peer-review. Scholarly articles are not without flaws, but their publication process includes many steps for verifying facts, reducing bias, and identifying conflicts of interest.
Tip: Many databases house a variety of information sources (not just scholarly articles). If you want to only see scholarly articles in your results, look for a way to limit to "peer-reviewed" or "academic articles" or another similar option to take out any results that are not scholarly articles. These options can usually be found in the advanced search section of a databases or in within the limiter options on the side of the results list.