CS fundamentals
DBMS & SQL
ER models, normalisation, transactions, indexing and SQL, from interview basics to how databases work inside.
DBMS (complete)
Gate Smashers, 140 videos, Hindi
The most-watched DBMS playlist for Indian placements; crisp and complete.
4 picks, in suggested order
More in CS fundamentals
Operating Systems
Processes, threads, scheduling, synchronisation, deadlocks and memory management: the OS questions every SDE interview asks.
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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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Computer Organisation & Architecture
How a CPU runs your code: instruction formats, pipelining, caches and memory hierarchy.
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Theory of Computation & Compilers
Automata, regular expressions, grammars and how a compiler turns source code into machine code.
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