Deep Learning
Learning Notebook
Master every concept used in the LLD problems. Each lesson teaches one idea from scratch — with real-world analogies, step-by-step examples, and code you can follow along.
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OOP Fundamentals
8 lessonsClasses & Objects: Blueprints and Buildings
Encapsulation: Protecting Your Data
Requires: oop-classes-objects
Inheritance: Standing on the Shoulders of Giants
Requires: oop-encapsulation
Polymorphism: One Interface, Many Forms
Requires: oop-inheritance
Abstraction: Hiding the Complexity
Requires: oop-polymorphism
Interfaces: The Contract
Requires: oop-abstraction
Composition Over Inheritance: Has-A vs Is-A
Requires: oop-interfaces
Putting It All Together: A Mini Design Exercise
Requires: oop-composition
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SOLID Principles
5 lessons🏗️
Design Patterns
6 lessons⚡
Algorithms & Data Structures
5 lessons🔄
Concurrency Deep Dive
8 lessonsImmutability: The Simplest Thread Safety
Thread Confinement: No Sharing, No Problems
Requires: immutability
Atomic Operations & CAS: Lock-Free Magic
Requires: thread-confinement
Semaphores: The Bouncer at the Club
Requires: atomic-operations
ReentrantLock & Condition: Advanced Wait/Notify
Requires: semaphore-pool
ConcurrentSkipListMap: Thread-Safe Sorted Map
Requires: atomic-operations
Hash-Based Executor: Per-Key Ordering
Requires: thread-confinement
CompletableFuture: Async Without the Pain
Requires: hash-based-executor
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Concurrency Practice
5 lessonsThread-Safe Counter: Your First Concurrency Bug
Requires: atomic-operations
Print Sequence with Multiple Threads
Requires: condition-await
Producer-Consumer Pattern: The Restaurant Kitchen
Requires: condition-await
Build Your Own BlockingQueue from Scratch
Requires: producer-consumer
Reader-Writer Lock: The Library Problem
Requires: blocking-queue