The third installment of GitHub Security Lab’s series on the OWASP Top 10 Proactive Controls emphasizes the importance of leveraging existing security frameworks and libraries instead of developing security-related controls from scratch, which requires significant expertise. This approach aids in efficiently achieving security goals by benefiting from established expertise and community-driven improvements, thus making the code more secure against vulnerabilities. Developers are advised to carefully evaluate security libraries and frameworks based on factors such as usage, reputation, maintenance, maturity, and security stewardship. Using web frameworks with built-in security can simplify handling threats like XSS and SQL injection by providing secure defaults and enforcing secure coding practices. To ensure ongoing security, developers should encapsulate libraries for easy updates and employ static analysis tools like CodeQL to enforce security invariants and detect potential issues. Additionally, maintaining security dependencies up-to-date through tools like GitHub Dependabot and understanding the role of security headers are crucial for a robust security posture.