Free, structured study notes for DSA, Computer Networks, Operating Systems & SQL — built to help you crack your next tech interview. All code in Python.
Four core CS subjects — curated, concise, and interview-ready.
Master arrays, linked lists, trees, graphs, sorting, dynamic programming, backtracking and 50+ coding patterns.
Start LearningOSI & TCP/IP models, HTTP, DNS, routing protocols, network security — everything you need for interviews.
Start LearningProcess management, memory, deadlocks, file systems, scheduling algorithms — all with clear examples.
Start LearningFrom basic queries to window functions, CTEs, normalization, indexing — with ready-to-run examples.
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Every topic is written with placement interviews in mind — no fluff, just what matters.
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Topics follow a logical order — from fundamentals to advanced concepts, no jumping around.
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Quick answers to things people usually ask.