Much has been made of the nature of peer contributions to Wikipedia. Conventional wisdom is that widespread contribution without adequate credentialing of contributors will lead to poor accuracy and poor reliability of information. Some studies contradict the conventional wisdom; others confirm it.
Wikipedia entries often contain many references. The editors of the Wikipedia page have read those sources, summarized the content and added it to the Wikipedia entry. Is the Wikipedia editor able to understand the scholarly journal article they just read and summarized? Possibly yes and possibly no. But you can follow their reference and review the original study/book/article yourself!
Wikipedia should be used as a tool to get started, and should never be the only source of research.