This document introduces a practical guide published by the Brazilian National Secretariat of Justice for their content rating system. The guide provides an overview of the Secretariat and the objectives of the rating system. It then details the criteria used to analyze content involving violence, sex/nudity, and drugs for each rating level (GA to PG-18). It also discusses attenuating and aggravating elements, content descriptors, and guidelines for properly displaying rating symbols on various media like movies, games, websites and live events. The aim is to provide families with reliable tools to make informed choices about what media is appropriate for children.