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| Core Concept | Why It Matters | Free Hands-On Tool | |--------------|----------------|---------------------| | | Every API, every web app | curl , httpie , Wireshark | | Stateless vs Stateful | Scaling vs complexity | JWT + Redis | | CRUD & REST | 90% of backend work | Postman, FastAPI demo | | Database indexing | Speed vs storage | EXPLAIN in PostgreSQL | | Message queues | Async processing | Redis or RabbitMQ (Docker) | | Caching strategies | Latency reduction | Redis, Memcached | | Authentication | Security baseline | OAuth2, bcrypt demo | | Logging & monitoring | Debugging production | OpenTelemetry, Prometheus |