Spring Security is one of the most powerful yet misunderstood parts of the Spring ecosystem. In this video, we break it down from scratch—covering everything from filters and the authentication flow, to JWT, OAuth2 login, CSRF protection, and CORS configuration. Whether you’re building your first secure Spring Boot app or refining your authentication layers, this is your all-in-one guide. Learn how to properly structure login systems, role-based access, and method-level security using annotations like @PreAuthorize. You'll also understand when to disable CSRF and how to fix CORS errors in real-world setups. 🔒 Want a deeper dive into OAuth2 or JWT? Check out these: OAuth2 Deep Dive: JWT Simplified: 📌 Secure smarter. Code cleaner. Let’s go. Timestamps 00:00 Introduction – Why Spring Security Matters 00:57 What Is Spring Security? – Goals & Features Explained 01:40 Filters in Spring Security – JWT, Basic, OAuth2 03:05 Authentication Flow – UserDetailsService & PasswordEncoder 05:10 Building It: Dependencies, Setup & User Config 06:25 CSRF & CORS Explained – When to Disable for APIs 08:12 Annotations for Access Control – PreAuthorize & More AWS Certification: AWS Certified Cloud Practioner: AWS Certified Solution Architect Associate: AWS Certified Solution Architect Professional: #springsecurity #springmvc #springboot #java