Scholarly/academic/peer-reviewed sources are sources written by experts and are reviewed by experts in the field before the article is published.
You may consider scholars with subject expertise have authority in the area of your research topic and thus produce only good sources. However, like all types of sources and authorities, scholarly sources vary a lot by date, scope, method, and etc, making only some of them appropriate to cite in your research. Scholarly sources may have totally valid evidence but not so relevant to your research.
Finding a good scholarly source to use can sometimes be a messy process, but below are some questions you can ask yourself in order to determine if the academic article is worth using in your research.
Use the APA or the MLA Quick Guides to double check your citations. Make sure to pay attention to all the small details, every period and comma counts. Examples of a Reference or Works Cited list are included at the end of each guide.