New to vibe coding? Replit integrates many security features directly into the platform, and AI tools like Agent and Assistant can handle much of the heavy lifting, letting you focus on building. A comprehensive checklist is available for navigating security essentials, with 16 practical tips for how to build more secure apps simply. Always use HTTPS, validate and sanitize user input, keep secrets out of the browser, protect against CSRF, authentication and authorization are crucial, protect APIs, prevent SQL injection, implement standard security headers, and apply rate limiting to ensure your app is secure. Replit provides features like default HTTPS, DDoS protection, secure Secret management, and Agent's use of ORMs that handle significant parts automatically. AI tools can assist with implementing defenses and learning about security concepts as you build. Focus on the fundamentals, such as validating input, ensuring proper authentication/authorization, and keeping secrets safe. Security is proactive and informed, not achieving perfection overnight; it's about being aware and using the right tools to reduce risk and build amazing applications with more confidence.