CS fundamentals
Theory of Computation & Compilers
Automata, regular expressions, grammars and how a compiler turns source code into machine code.
Theory of Computation
Neso Academy, 40 videos, English
Builds DFA, NFA and regular languages slowly, with many solved examples.
3 picks, in suggested order
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Operating Systems
Processes, threads, scheduling, synchronisation, deadlocks and memory management: the OS questions every SDE interview asks.
Neso Academy, Gate Smashers, Hussein Nasser
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Computer Networks
From the OSI and TCP/IP models to routing, TCP, DNS and HTTP: how data actually moves between machines.
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3 playlists303 videosEnglishHindi
DBMS & SQL
ER models, normalisation, transactions, indexing and SQL, from interview basics to how databases work inside.
Gate Smashers, Rishabh Mishra, Arpit Bhayani, CMU Database Group
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Computer Organisation & Architecture
How a CPU runs your code: instruction formats, pipelining, caches and memory hierarchy.
Neso Academy, Gate Smashers
2 playlists166 videosEnglishHindi