There are two types of guidance documents necessary for conducting systematic reviews and other evidence syntheses, they serve different purposes and you need both to successfully navigate the process from planning to publication.
Handbooks and manuals provide practical methodological guidance for undertaking a systematic review. They contain detailed steps on how to plan, conduct, organize, and present your review. This is the best place to go if you have any questions about the best practices for any of the steps in the process.
From: Duke University