🧠 Top 7 Core CS Subjects to Master for Tech Interviews (2025 Edition) 💡💻

✅ Data Structures & Algorithms 
Arrays, Trees, Graphs, HashMaps, Linked Lists, Heaps

✅ Operating Systems 
Processes, Threads, Scheduling, Deadlocks, Memory Management

✅ DBMS (Databases) 
Normalization, Transactions, SQL vs NoSQL, Indexing, Joins

✅ Computer Networks 
OSI Model, TCP/IP, DNS, HTTP/HTTPS, Sockets

✅ Object-Oriented Programming (OOP) 
Encapsulation, Inheritance, Polymorphism, SOLID Principles

✅ System Design (HLD/LLD) 
Load balancing, caching, database sharding, scalability

✅ Programming Languages 
Deep understanding of your primary language (C++, Java, Python, etc.)

🎯 These are non-negotiable for top tech roles & product-based companies.

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