In-depth developer guides on V8 internals, Python architecture, SQL, Next.js, and placement drives.
Master Java concurrency: Thread states, Runnable vs Callable, synchronized blocks, volatile keywords, deadlock prevention, and ExecutorService thread pools.
Under the hood of the Java Collections Framework: HashMap collision handling with red-black trees, ArrayList dynamic capacity doubling, and ConcurrentHashMap locks.
Understand JVM internal runtime data areas: ClassLoader subsystem, Heap memory generations, Stack frames, Method Area, and exact Static vs Final behavior.
Master the core data structures in Python with time complexity breakdowns (Big-O), memory footprints, and practical coding patterns for technical interviews.