Critical appraisal tools help you to check the validity and accuracy of article information, tailored to specific study designs.
If you're not sure where to start read Buchieri and Shafiri’s article (2017) Critical Appraisal Tools and Reporting Guidelines for Evidence-Based Practice. It outlines the uses of appraisal tools, the strengths and weaknesses of different tools along with links to various examples. It also explains Reporting Guidelines, which assist in performing a study according to best practice guidelines.
You can see examples of guidelines on various topics and study types at The Equator Network.
A study-by-study synthesis is not generally included in traditional literature and scoping reviews as they employ a more general critical analysis.