This document serves as a comprehensive guide to DevSecOps, highlighting its principles, tools, and role in securing the software development life cycle (SDLC). It emphasizes the integration of security throughout the development process, approaching it as a continuous thread rather than a final phase. The guide discusses essential tools like dynamic and static application security testing, software composition analysis, and the importance of incident management, all aimed at fostering a secure, efficient, and agile software development environment.