86 free guides for freshers and experienced engineers: roadmaps for every tech role, how top companies hire, programming and core CS basics, and resume and interview preparation.
The Linux commands, file permissions, pipes, process tools and small shell scripts every developer, tester and support engineer should know, with practice tasks.
Understand object-oriented programming properly: the four pillars, class relationships, SOLID principles, the design patterns interviews ask about and how to approach low-level design questions.
The OS topics asked in placements and tech interviews: processes vs threads, scheduling with worked examples, synchronisation, deadlocks, paging, virtual memory and page replacement.
Learn Python the practical way and prepare for interviews: data types, mutability, comprehensions, functions, OOP, generators, decorators, exceptions, complexity and the questions asked most.
Learn React step by step and prepare for interviews: JSX, props, state, effects, forms, context, reducers, rendering and keys, performance, testing and the questions asked most.
Learn the core of Spring Boot by building a small REST API: project setup, controllers, JPA entities, repositories, validation, error handling and testing.
What SQL interviews cover: execution order, joins, NULL traps, grouping, window functions, classics like Nth highest salary, indexing and performance, with 20 solved queries.
Learn system design from the ground up: scaling, load balancing, caching, databases, queues, CAP, a repeatable interview method and worked examples like a URL shortener and a chat app.