A literature review is a summary of key findings on a particular topic.
The lead authors of the article will typically have their name listed first. In databases, you can click on the names of the authors to see what else they have written.
Look to see if any controversies have arisen from prior research. The articles you're reviewing will also make note of previous studies.
Consider if the researchers have been using, for example, survey or review methodology. Contemplate if the prior research is strong enough to justify the results.
Consider ways in which your research will answer questions that haven't been answered by the research from your literature review.
Is there a pattern emerging across multiple studies? Do all of the studies point to the same thing, or are there outliers?
Oftentimes, journal articles will indicate the limitations of the underlying studies. In the summary section, researchers may indicate areas for future consideration.
Perhaps there's a government repository that will contain useful studies. Or another particular institution that focuses on this area. Also consider if herding may occur if focusing on only a particular group of researchers.
Refer to the conclusions of prior studies to articulate how your research initiatives will build upon it.