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AiTechWorlds
AiTechWorlds
Programming Web
The 15 coding interview patterns that cover most problems — the signal that identifies each one, a minimal code skeleton, and a two-minute recognition table.
A practical big O cheat sheet — the complexity ladder with real examples, data structure operation tables, and how to state your complexity in an interview.
A practical Git commands cheat sheet — the 12 commands you use daily, the undo commands that rescue you, and the five mistakes that break repositories.
A practical JavaScript cheat sheet — array methods, destructuring, async/await, optional chaining, and the equality and this-binding traps that catch everyone.
A practical Kubernetes cheat sheet — the object model explained as a map, kubectl commands grouped by task, probes, resource limits, and how to debug a crashing pod.
A practical Linux commands cheat sheet for beginners — navigation, files, permissions, processes, search and networking, with the mistakes that cost people data.
A practical networking cheat sheet — OSI and TCP/IP layers, ports, TCP vs UDP vs QUIC, DNS resolution, TLS, CIDR and NAT, plus the diagnostic command sequence.
A practical Python cheat sheet covering syntax, data structures, comprehensions, the standard library and the mutable-default trap that catches everyone.
A practical React cheat sheet — hooks reference, the useEffect dependency rules, state patterns, performance, and the mistakes that cause infinite render loops.
A practical regex cheat sheet — character classes, quantifiers, anchors, groups, lookarounds, flags, 15 ready patterns, and why catastrophic backtracking kills servers.
A practical SQL cheat sheet — the JOIN types explained properly, window functions, query order of execution, and the LEFT JOIN mistake that silently breaks results.
A one-page system design cheat sheet — the interview sequence that decides the outcome, back-of-envelope numbers, every building block, and SQL vs NoSQL.
A practical TypeScript cheat sheet — basic types, interfaces vs types, generics, the five utility types you actually use, and why any is worse than unknown.
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