📂 API Design Roadmap
┃
┣ 📂 Foundations
┃ ┣ 📂 What is an API?
┃ ┣ 📂 HTTP & HTTPS Fundamentals
┃ ┣ 📂 Request & Response Lifecycle
┃ ┣ 📂 JSON & Data Formats
┃ ┗ 📂 API Design Principles
┃
┣ 📂 REST API Design
┃ ┣ 📂 REST Architecture
┃ ┣ 📂 Resources & Endpoints
┃ ┣ 📂 HTTP Methods (GET, POST, PUT, DELETE, PATCH)
┃ ┣ 📂 Status Codes
┃ ┗ 📂 REST Best Practices
┃
┣ 📂 API Documentation
┃ ┣ 📂 OpenAPI Specification
┃ ┣ 📂 Swagger UI
┃ ┣ 📂 API Reference Documentation
┃ ┣ 📂 Examples & SDKs
┃ ┗ 📂 Versioned Documentation
┃
┣ 📂 Authentication & Authorization
┃ ┣ 📂 API Keys
┃ ┣ 📂 JWT Authentication
┃ ┣ 📂 OAuth 2.0 & OpenID Connect
┃ ┣ 📂 Role-Based Access Control (RBAC)
┃ ┗ 📂 Token Management
┃
┣ 📂 API Security
┃ ┣ 📂 HTTPS & TLS
┃ ┣ 📂 CORS Configuration
┃ ┣ 📂 CSRF & XSS Protection
┃ ┣ 📂 Rate Limiting & Throttling
┃ ┗ 📂 Input Validation & Sanitization
┃
┣ 📂 Advanced API Architectures
┃ ┣ 📂 GraphQL
┃ ┣ 📂 gRPC
┃ ┣ 📂 WebSockets
┃ ┣ 📂 Server-Sent Events (SSE)
┃ ┗ 📂 Event-Driven APIs
┃
┣ 📂 API Performance
┃ ┣ 📂 Pagination
┃ ┣ 📂 Filtering & Sorting
┃ ┣ 📂 Caching Strategies
┃ ┣ 📂 Compression
┃ ┗ 📂 Performance Optimization
┃
┣ 📂 API Reliability
┃ ┣ 📂 Error Handling
┃ ┣ 📂 Retry Strategies
┃ ┣ 📂 Idempotency
┃ ┣ 📂 Circuit Breaker Pattern
┃ ┗ 📂 Health Checks
┃
┣ 📂 API Testing
┃ ┣ 📂 Unit Testing
┃ ┣ 📂 Integration Testing
┃ ┣ 📂 Postman & Insomnia
┃ ┣ 📂 Load Testing
┃ ┗ 📂 Contract Testing
┃
┣ 📂 API Deployment
┃ ┣ 📂 API Gateways
┃ ┣ 📂 Reverse Proxies
┃ ┣ 📂 Docker & Containers
┃ ┣ 📂 CI/CD Pipelines
┃ ┗ 📂 Cloud Deployment
┃
┣ 📂 Monitoring & Observability
┃ ┣ 📂 Logging
┃ ┣ 📂 Metrics Collection
┃ ┣ 📂 Distributed Tracing
┃ ┣ 📂 Prometheus & Grafana
┃ ┗ 📂 API Analytics
┃
┣ 📂 AI-Powered APIs
┃ ┣ 📂 OpenAI API Integration
┃ ┣ 📂 Function Calling
┃ ┣ 📂 Streaming Responses
┃ ┣ 📂 AI Agent APIs
┃ ┗ 📂 Cost & Token Optimization
┃
┣ 📂 Real-World Projects
┃ ┣ 📂 Authentication API
┃ ┣ 📂 E-commerce REST API
┃ ┣ 📂 Payment Gateway API
┃ ┣ 📂 AI Chat API
┃ ┗ 📂 Microservices API Platform
┃
┣ 📂 Practice & Growth
┃ ┣ 📂 Build Public APIs
┃ ┣ 📂 Contribute to API Projects
┃ ┣ 📂 Write API Documentation
┃ ┣ 📂 API Design Reviews
┃ ┗ 📂 Interview Preparation
┃
┗ 📂 Career & Monetization
┣ 📂 Backend Engineer Roles
┣ 📂 API Platform Engineer
┣ 📂 SaaS Development
┣ 📂 API Consulting & Freelancing
┗ 📂 Continuous Learning

👉 Follow this consistently for 2–4 months and you'll be able to design, build, secure, and scale production-ready APIs with confidence.