If an article is peer-reviewed, you can assume the reliability and quality of the information. In many bibliographic files you can indicate in your search that you only want peer-reviewed articles.
Peer review is a form of quality assessment. The English word "peer" ("equal") in this context is best translated by "co-researcher". A peer review is therefore an assessment by a colleague. Peer reviewers assess whether an article meets certain requirements, such as originality, accessibility and a solid foundation for the results. All scientific journals work with such a system to guarantee the quality of the articles included in that journal.
(Source: Information literacy: The peer review process, University of Groningen)
