Shifting security "left" in the software development life cycle (SDLC) involves integrating security measures from the beginning stages of development, which requires developers to take on more responsibility for security principles. This approach aims to improve software quality and reduce time spent on fixing vulnerabilities by providing a layered security strategy that includes various testing tools. Static Application Security Testing (SAST) is used early in development to scan source code for vulnerabilities, while Secrets Detection focuses on identifying sensitive information within code history. Dependency Scanning helps detect vulnerabilities in external libraries, and Dynamic Application Security Testing (DAST) identifies issues in running applications. Interactive Application Security Testing (IAST) combines elements of both SAST and DAST, providing insights into runtime environments, whereas Runtime Application Self-Protection (RASP) actively detects and mitigates threats in real-time. The blog emphasizes the importance of selecting tools that integrate well into existing workflows, recognizing that security is an essential skill for developers, and acknowledging the value of investing in comprehensive security practices throughout the SDLC.