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Master pytest — writing tests, fixtures for setup, parametrize for data-driven tests, patch for mocking dependencies, and coverage reporting.
Master PHP named arguments for skipping optional parameters and PHP 8 Attributes as first-class annotations with Reflection API.
10 real SQL interview questions from TCS, Infosys, Amazon, Flipkart — second highest salary, duplicate emails, ACID, window functions, and more.
Master React Hooks — when to use each hook, performance optimization with useCallback and useMemo, DOM refs, and custom hook patterns.
Master Python asyncio — coroutines, async/await, asyncio.gather for concurrency, create_task, cancellation, and aiohttp for async HTTP.
Master Python dataclasses — auto-generated init/repr/eq, frozen immutable instances, slots for memory efficiency, and attrs for advanced validation.
Definitively understand interfaces vs abstract classes in PHP — contracts vs implementation, multiple vs single inheritance, decision framework.
Design clean REST APIs — resource naming, correct HTTP methods and status codes, URL versioning, cursor and offset pagination, consistent error responses.
Start TypeScript from scratch — type annotations, union types, interfaces, generics with constraints, and type narrowing with typeof/instanceof.
