This class note aims to clarify the content and practical applications of the Criminal Procedure subject, and it will delve into matters related to its conceptualization, the importance of understanding the basic concepts of criminal law, criminal offenses, and their consequences. The theoretical part of criminal procedure, the fundamental principles of procedural criminal law, and their relationship with other areas of law will be analyzed. A conceptual characterization of the penal system, the normative hierarchy, and a detailed overview of the legal order in the Colombian penal regime will be developed, taking into account the current regulations. Finally, the aim is to provide a well-detailed outline of the topics to be covered in the Criminal Procedure course. Moreover, it will demonstrate how these contents can be practically applied in the legal field to resolve common situations encountered during the student’s academic journey.