Topics

Pick a topic and start practicing. Each one groups exercises by theme and difficulty with expert-written explanations and solutions.

Frontend Foundations

HTML, CSS, JavaScript, DOM manipulation, accessibility

Languages: html, css, javascript

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React & Next.js

Components, hooks, state management, SSR, routing

Languages: typescript, javascript

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Backend with Node.js

Express, middleware, authentication, REST APIs

Languages: javascript, typescript

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Python Fundamentals

Core syntax, data structures, scripting, file I/O

Languages: python

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Database & SQL

Queries, joins, indexing, migrations, data modeling

Languages: sql

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DevOps & Cloud

Docker, CI/CD, AWS basics, Terraform, infrastructure

Languages: yaml, bash, hcl

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TypeScript Advanced

Generics, utility types, type guards, config patterns

Languages: typescript

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System Design

Architecture, scaling, caching, load balancing, messaging

Languages: mixed

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Security & Auth

OAuth, JWT, encryption, OWASP, input validation

Languages: typescript, python

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Mobile Development

React Native, Flutter basics, cross-platform patterns

Languages: typescript, dart

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Data Science

Pandas, NumPy, scikit-learn, data visualization

Languages: python

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Algorithms & DSA

Sorting, graphs, dynamic programming, interview prep

Languages: python, typescript, java

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API Design

REST, GraphQL, gRPC, WebSockets, versioning, documentation

Languages: typescript, graphql

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Testing & QA

Unit, integration, E2E, TDD, mocking frameworks

Languages: typescript, javascript, python

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Linux & CLI

Shell scripting, sysadmin, networking, command-line tools

Languages: bash

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Go Programming

Goroutines, channels, interfaces, error handling, tooling

Languages: go

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Rust Fundamentals

Ownership, borrowing, lifetimes, traits, pattern matching

Languages: rust

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Java Core

OOP, collections, streams, concurrency, JVM basics

Languages: java

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CSS & Layouts

Flexbox, Grid, responsive design, animations, variables

Languages: css

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Git & Version Control

Branching, merging, rebasing, conflict resolution, workflows

Languages: bash

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