STEP 1: EVENT LOOP + ASYNC INTERNALS (FOUNDATION)
STEP 2: STREAMS & BUFFERS (CORE NODE.IO)
STEP 3: CLUSTER & WORKER THREADS (SCALING NODE)
STEP 4: MEMORY MANAGEMENT & V8 GARBAGE COLLECTION (ADVANCED NODE)
STEP 5: ERROR HANDLING & PROCESS LIFECYCLE IN NODE.JS
STEP 6: EXPRESS INTERNALS & MIDDLEWARE DESIGN
STEP 7: SECURITY IN NODE.JS (PRACTICAL DEFENSE STRATEGIES)
STEP 8: PERFORMANCE OPTIMIZATION IN NODE.JS
STEP 9: TESTING, CI/CD & OBSERVABILITY IN NODE.JS
STEP 10: BUILDING SCALABLE SYSTEMS — MESSAGE QUEUES & MICROSERVICES IN NODE.JS
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https://www.youtube.com/watch?v=AZzV3wZCvI4&list=PL78RhpUUKSwfeSOOwfE9x6l5jTjn5LbY3