Learn to code, one focused lesson at a time.

Hands-on tutorials for C, Python and more — split into bite-sized segments you can read as a page or watch as 30-second shorts, in your language.

Programming Languages

• Advanced Java — Beyond the basics — lambdas and streams, concurrency, the JVM, JDBC, and the enterprise stack. (38 lessons)
• Bash / Shell Scripting — Build practical foundations in Bash / Shell Scripting, from first scripts to reliable programs. (25 lessons)
• C Programming — The foundational systems language behind operating systems, compilers and embedded devices. (36 lessons)
• Core Java — The language fundamentals — syntax, the JVM, object-oriented design, collections and exceptions. (38 lessons)
• C++ — From your first compiled program to STL, memory, and interview-ready problem solving. (25 lessons)
• Dart — Build practical foundations in Dart. (25 lessons)
• C#/.NET — Build practical foundations in C#/.NET. (25 lessons)
• Go (Golang) — Build clear, fast services with Go fundamentals, concurrency, testing, and HTTP. (27 lessons)
• JavaScript — The language of the web — dynamic, asynchronous, and running everywhere from browsers to servers. (38 lessons)
• Kotlin — Learn Kotlin syntax, null safety, objects, collections, and coroutines. (25 lessons)
• PHP — Build practical foundations in PHP, from first scripts to reliable programs. (25 lessons)
• Python — A readable, batteries-included language for scripting, data science, web and automation. (47 lessons)
• Rust — Learn Rust foundations, ownership, safe memory, error handling, and concurrency. (25 lessons)
• Swift — Build practical foundations in Swift. (25 lessons)
• TypeScript — JavaScript with static types — catch bugs before you ever run the code. (26 lessons)
• WebAssembly — Build practical foundations in WebAssembly. (25 lessons)

Computer Science Fundamentals

• Time & Space Complexity (Big-O) — Build practical foundations in Time & Space Complexity (Big-O). (25 lessons)
• Competitive Programming — Build practical foundations in Competitive Programming. (25 lessons)
• Compilers & Memory Management — Build practical foundations in Compilers & Memory Management. (25 lessons)
• Computer Networks — Build practical foundations in Computer Networks. (25 lessons)
• Data Structures in Python — Build practical foundations in Data Structures in Python. (25 lessons)
• Database Fundamentals — Build practical foundations in Database Fundamentals. (25 lessons)
• Design Patterns — Build practical foundations in Design Patterns. (25 lessons)
• Data Structures & Algorithms — A visual, interview-focused walk through the core data structures and algorithms: how they work, when to reach for them, and the patterns behind the questions. (42 lessons)
• Object-Oriented Programming (OOP) — Build practical foundations in Object-Oriented Programming (OOP). (25 lessons)
• Operating System Concepts — Build practical foundations in Operating System Concepts. (25 lessons)

Frontend Development

• Web Accessibility (A11y) — Build inclusive web experiences with WCAG standards, semantic HTML, ARIA, and assistive technology compatibility. (25 lessons)
• Angular — A TypeScript framework for building fast, structured single-page web apps. (30 lessons)
• Astro — Build practical foundations in Astro. (25 lessons)
• Astro Starlight — Build practical foundations in Astro Starlight. (25 lessons)
• Babel & SWC — Master JavaScript transpilation with Babel and learn how SWC modernizes the toolchain for faster builds. (30 lessons)
• Bootstrap — Build practical foundations in Bootstrap. (25 lessons)
• CSS — Style, layout and motion for the web — from box model to Grid and animation. (28 lessons)
• CSS Architecture — Build practical foundations in CSS Architecture. (25 lessons)
• Flutter — Build practical foundations in Flutter. (25 lessons)
• HTML — The markup language that structures every web page — learn to build one tag at a time. (28 lessons)
• Next.js — Build practical foundations in Next.js. (25 lessons)
• Nuxt — Build practical foundations in Nuxt. (25 lessons)
• npm / pnpm / yarn — Build practical foundations in npm / pnpm / yarn. (25 lessons)
• Progressive Web Apps — Master Progressive Web Apps from core concepts to deployment, building app-like experiences on the web. (29 lessons)
• React — Build practical foundations in React. (25 lessons)
• React Native — Build practical foundations in React Native. (25 lessons)
• Redux Toolkit / Zustand — Build practical foundations in Redux Toolkit / Zustand. (25 lessons)
• Remix — Build practical foundations in Remix. (25 lessons)
• Responsive & Mobile-First Design — Build fluid layouts that adapt gracefully across all devices — from mobile to desktop. (25 lessons)
• RxJS — Build practical foundations in RxJS. (25 lessons)
• Sass / SCSS — Build practical foundations in Sass / SCSS. (25 lessons)
• SEO for Developers — Master search engine optimization fundamentals to build websites that rank well and drive organic traffic. (32 lessons)
• SolidJS — Build practical foundations in SolidJS. (25 lessons)
• Storybook — Build and test components in isolation with Storybook, the essential tool for component-driven development. (25 lessons)
• Svelte / SvelteKit — Build practical foundations in Svelte / SvelteKit. (25 lessons)
• Tailwind CSS — Build practical foundations in Tailwind CSS. (25 lessons)
• TanStack Query — Build practical foundations in TanStack Query. (25 lessons)
• Three.js — Build practical foundations in Three.js. (25 lessons)
• Vite — Build practical foundations in Vite. (25 lessons)
• Vue.js — Build practical foundations in Vue.js. (25 lessons)
• Vue Native — Build practical foundations in Vue Native. (25 lessons)
• Web Performance Optimization — Master performance metrics, optimization techniques, and tools to build fast, user-friendly web applications. (25 lessons)

Backend Development

• API Design & Versioning — Build practical foundations in API Design & Versioning. (25 lessons)
• Authentication & Authorization — Build practical foundations in Authentication & Authorization. (25 lessons)
• Cron & Scheduled Jobs — Build practical foundations in Cron & Scheduled Jobs. (25 lessons)
• Directus Headless CMS Basics — Build practical foundations in Directus Headless CMS Basics. (25 lessons)
• Django / FastAPI — Build practical foundations in Django / FastAPI. (25 lessons)
• .NET Core — Build practical foundations in .NET Core. (25 lessons)
• Express.js — A minimal, unopinionated Node.js framework for building web servers and APIs. (23 lessons)
• Fastify — A fast, low-overhead Node.js web framework for building high-performance APIs and servers. (30 lessons)
• Firebase — Build practical foundations in Firebase. (25 lessons)
• GraphQL — Build practical foundations in GraphQL. (25 lessons)
• gRPC — Build practical foundations in gRPC. (25 lessons)
• Keycloak / Auth0 — Build practical foundations in Keycloak / Auth0. (25 lessons)
• BullMQ / Celery — Build practical foundations in BullMQ / Celery. (25 lessons)
• Apache Kafka — Build practical foundations in Apache Kafka. (25 lessons)
• Laravel — Build practical foundations in Laravel. (25 lessons)
• MERN Deployment Patterns — Build practical foundations in MERN Deployment Patterns. (25 lessons)
• NestJS — A progressive Node.js framework for building efficient, scalable, and maintainable server-side applications. (33 lessons)
• Node.js — A JavaScript runtime for servers, CLIs and tooling, built on Chrome's V8 engine. (28 lessons)
• OpenAPI / Swagger — Build practical foundations in OpenAPI / Swagger. (25 lessons)
• OWASP Top 10 — Build practical foundations in OWASP Top 10. (25 lessons)
• Postman / Insomnia — Build practical foundations in Postman / Insomnia. (25 lessons)
• RabbitMQ — Build practical foundations in RabbitMQ. (25 lessons)
• Rate Limiting & Throttling — Build practical foundations in Rate Limiting & Throttling. (25 lessons)
• WebSockets & Server-Sent Events — Build practical foundations in WebSockets & Server-Sent Events. (25 lessons)
• Redis Pub/Sub & Streams — Build practical foundations in Redis Pub/Sub & Streams. (25 lessons)
• REST API Design — Designing clean, predictable HTTP APIs: resources, status codes, versioning, auth, and the conventions that make an API pleasant to use. (24 lessons)
• Secrets Management — Build practical foundations in Secrets Management. (25 lessons)
• Spring Boot — Build practical foundations in Spring Boot. (25 lessons)
• Stripe Payments — Build practical foundations in Stripe Payments. (25 lessons)
• Supabase — Build practical foundations in Supabase. (25 lessons)
• WebRTC — Build practical foundations in WebRTC. (25 lessons)

Databases & Data Stores

• ClickHouse / BigQuery / Snowflake — Build practical foundations in ClickHouse / BigQuery / Snowflake. (25 lessons)
• Cassandra / DynamoDB — Build practical foundations in Cassandra / DynamoDB. (25 lessons)
• Database Migrations — Build practical foundations in Database Migrations. (25 lessons)
• Elasticsearch — Build practical foundations in Elasticsearch. (25 lessons)
• Graph Databases / Neo4j — Build practical foundations in Graph Databases / Neo4j. (25 lessons)
• Hibernate / JPA — Build practical foundations in Hibernate / JPA. (25 lessons)
• MongoDB — A flexible, JSON-style NoSQL document database for modern applications. (22 lessons)
• Mongoose — Build practical foundations in Mongoose. (25 lessons)
• MySQL — The world's most popular open-source relational database, and the SQL that drives it. (28 lessons)
• Prisma / TypeORM / Sequelize — Build practical foundations in Prisma / TypeORM / Sequelize. (25 lessons)
• PostgreSQL — Build practical foundations in PostgreSQL. (25 lessons)
• Redis — A blazing-fast in-memory data store for caching, sessions, queues and real-time data. (18 lessons)
• SQL Deep Dive — Build practical foundations in SQL Deep Dive. (25 lessons)
• SQLAlchemy — Build practical foundations in SQLAlchemy. (25 lessons)
• Vector Databases — Build practical foundations in Vector Databases. (25 lessons)

DevOps, Cloud & Infrastructure

• Ansible — Build practical foundations in Ansible. (25 lessons)
• Secure API-Key & Secret Rotation — Build practical foundations in Secure API-Key & Secret Rotation. (25 lessons)
• AWS — Cloud computing with AWS: compute, storage, networking, and the managed services that power modern apps. (26 lessons)
• Azure — Build practical foundations in Azure. (25 lessons)
• Branching Strategies — Build practical foundations in Branching Strategies. (25 lessons)
• CDN — Build practical foundations in CDN. (25 lessons)
• CI/CD — Automating the path from code commit to production: continuous integration, continuous delivery, and continuous deployment. (21 lessons)
• Cloudflare Workers — Build practical foundations in Cloudflare Workers. (25 lessons)
• Container Registries & Image Security — Build practical foundations in Container Registries & Image Security. (25 lessons)
• Conventional Commits & Semantic Release — Build practical foundations in Conventional Commits & Semantic Release. (25 lessons)
• cPanel / WHM — Build practical foundations in cPanel / WHM. (25 lessons)
• Datadog / New Relic — Build practical foundations in Datadog / New Relic. (25 lessons)
• Blue-Green & Canary Deployments — Build practical foundations in Blue-Green & Canary Deployments. (25 lessons)
• DNS, SSL/TLS & Certificate Management — Build practical foundations in DNS, SSL/TLS & Certificate Management. (25 lessons)
• Docker — Package, ship and run any app the same way, everywhere — with containers. (26 lessons)
• Docker Compose — Build practical foundations in Docker Compose. (25 lessons)
• ELK / Elastic Stack — Build practical foundations in ELK / Elastic Stack. (25 lessons)
• Google Cloud Platform — Build practical foundations in Google Cloud Platform. (25 lessons)
• Git — The distributed version control system that tracks every change to your code. (26 lessons)
• GitHub — Host your Git repositories and collaborate on code with pull requests, issues and CI. (18 lessons)
• GitHub Actions — Build practical foundations in GitHub Actions. (25 lessons)
• GitLab / Bitbucket — Build practical foundations in GitLab / Bitbucket. (25 lessons)
• GitLab CI / Jenkins — Build practical foundations in GitLab CI / Jenkins. (25 lessons)
• HAProxy — Build practical foundations in HAProxy. (25 lessons)
• Helm — Build practical foundations in Helm. (25 lessons)
• Kubernetes — Build practical foundations in Kubernetes. (25 lessons)
• Kubernetes Secrets with HashiCorp Vault — Build practical foundations in Kubernetes Secrets with HashiCorp Vault. (25 lessons)
• Linux — Master the command line and the Linux fundamentals that power servers, containers and the cloud. (29 lessons)
• Load Balancing & Reverse Proxies — Build practical foundations in Load Balancing & Reverse Proxies. (25 lessons)
• Nginx — Build practical foundations in Nginx. (25 lessons)
• Logging, Metrics, Tracing & Alerting — Build practical foundations in Logging, Metrics, Tracing & Alerting. (25 lessons)
• OpenTelemetry — Build practical foundations in OpenTelemetry. (25 lessons)
• PaaS / Hosting — Build practical foundations in PaaS / Hosting. (25 lessons)
• Packer — Build practical foundations in Packer. (25 lessons)
• Prometheus + Grafana — Build practical foundations in Prometheus + Grafana. (25 lessons)
• Pulumi — Build practical foundations in Pulumi. (25 lessons)
• Rackspace — Build practical foundations in Rackspace. (25 lessons)
• Redis Monitoring Dashboards — Build practical foundations in Redis Monitoring Dashboards. (25 lessons)
• Build & Release Pipelines — Build practical foundations in Build & Release Pipelines. (25 lessons)
• Sentry — Build practical foundations in Sentry. (25 lessons)
• Serverless & Edge — Build practical foundations in Serverless & Edge. (25 lessons)
• Shell Scripting — Build practical foundations in Shell Scripting. (25 lessons)
• SSH & Server Hardening — Build practical foundations in SSH & Server Hardening. (25 lessons)
• Terraform — Build practical foundations in Terraform. (25 lessons)
• Trivy Container Security Scanning — Build practical foundations in Trivy Container Security Scanning. (25 lessons)

System Design & Architecture

• API Gateway & Service Mesh — Build practical foundations in API Gateway & Service Mesh. (25 lessons)
• Caching Strategies & CDN Design — Build practical foundations in Caching Strategies & CDN Design. (25 lessons)
• CAP Theorem & Consistency Models — Build practical foundations in CAP Theorem & Consistency Models. (25 lessons)
• Cost & Capacity Estimation — Build practical foundations in Cost & Capacity Estimation. (25 lessons)
• High-Level & Low-Level Design Interview Problems — Build practical foundations in High-Level & Low-Level Design Interview Problems. (25 lessons)
• Event-Driven Architecture & CQRS — Build practical foundations in Event-Driven Architecture & CQRS. (25 lessons)
• Healthcare / HIPAA Architecture Fundamentals — Build practical foundations in Healthcare / HIPAA Architecture Fundamentals. (25 lessons)
• Monolith vs Microservices — Build practical foundations in Monolith vs Microservices. (25 lessons)
• Rate Limiting, Circuit Breakers & Resilience Patterns — Build practical foundations in Rate Limiting, Circuit Breakers & Resilience Patterns. (25 lessons)
• Scalability, Availability & Reliability — Build practical foundations in Scalability, Availability & Reliability. (25 lessons)
• Load Balancing & Sharding — Build practical foundations in Load Balancing & Sharding. (25 lessons)
• System Design — How to design large-scale systems: requirements, estimation, building blocks, and trade-offs for scale and reliability. (32 lessons)

Testing & Quality

• API Testing — Build practical foundations in API Testing. (25 lessons)
• Contract Testing — Build practical foundations in Contract Testing. (25 lessons)
• Playwright & Cypress — Build practical foundations in Playwright & Cypress. (25 lessons)
• JUnit 5 & Mockito — Build practical foundations in JUnit 5 & Mockito. (25 lessons)
• Jest, Vitest & Testing Library — Build practical foundations in Jest, Vitest & Testing Library. (25 lessons)
• Load & Performance Testing — Build practical foundations in Load & Performance Testing. (25 lessons)
• PHPUnit — Build practical foundations in PHPUnit. (25 lessons)
• pytest — Build practical foundations in pytest. (25 lessons)
• Secure Coding Practices — Build practical foundations in Secure Coding Practices. (25 lessons)
• Static Analysis — Build practical foundations in Static Analysis. (25 lessons)
• TDD & BDD — Build practical foundations in TDD & BDD. (25 lessons)
• Test Pyramid, Mocking, Fixtures & Coverage — Build practical foundations in Test Pyramid, Mocking, Fixtures & Coverage. (25 lessons)
• Testing Fundamentals — Build practical foundations in Testing Fundamentals. (25 lessons)

Artificial Intelligence & Data

• Agent Frameworks & MCP Basics — Build practical foundations in Agent Frameworks & MCP Basics. (25 lessons)
• Agent Loops, Stop Conditions & Token Budgets — Build practical foundations in Agent Loops, Stop Conditions & Token Budgets. (25 lessons)
• Advanced Agent Workflows & Skills — Build practical foundations in Advanced Agent Workflows & Skills. (25 lessons)
• AI Agents & Tool Use / MCP — Build practical foundations in AI Agents & Tool Use / MCP. (25 lessons)
• Estimating AI Automation ROI — Build practical foundations in Estimating AI Automation ROI. (25 lessons)
• AI Coding Assistants — Build practical foundations in AI Coding Assistants. (25 lessons)
• Safe Rollout Plans for AI Features — Build practical foundations in Safe Rollout Plans for AI Features. (25 lessons)
• AI Safety, Evaluation & Cost Control — Build practical foundations in AI Safety, Evaluation & Cost Control. (25 lessons)
• AI Strategy, Ethics & Governance — Build practical foundations in AI Strategy, Ethics & Governance. (25 lessons)
• AI Visibility & LLM Brand Discovery — Build practical foundations in AI Visibility & LLM Brand Discovery. (25 lessons)
• Apache Airflow — Build practical foundations in Apache Airflow. (25 lessons)
• Artificial Intelligence — Build practical foundations in Artificial Intelligence. (25 lessons)
• Claude Code Skills & SKILL.md — Build practical foundations in Claude Code Skills & SKILL.md. (25 lessons)
• AI Coding-Agent Guardrails — Build practical foundations in AI Coding-Agent Guardrails. (25 lessons)
• Coding Agents & AI-Assisted Development — Build practical foundations in Coding Agents & AI-Assisted Development. (25 lessons)
• Computer Vision — Build practical foundations in Computer Vision. (25 lessons)
• Data Warehousing & Modelling — Build practical foundations in Data Warehousing & Modelling. (25 lessons)
• Deep Learning & Neural Networks — Build practical foundations in Deep Learning & Neural Networks. (25 lessons)
• Dify Workflow Basics — Build practical foundations in Dify Workflow Basics. (25 lessons)
• Embeddings & Vector Search — Build practical foundations in Embeddings & Vector Search. (25 lessons)
• ETL / ELT Pipelines — Build practical foundations in ETL / ELT Pipelines. (25 lessons)
• Fine-tuning vs Prompting — Build practical foundations in Fine-tuning vs Prompting. (25 lessons)
• LangChain / LlamaIndex — Build practical foundations in LangChain / LlamaIndex. (25 lessons)
• LangGraph Agents & Multi-Agent Systems — Build practical foundations in LangGraph Agents & Multi-Agent Systems. (25 lessons)
• Claude API / OpenAI API Basics — Build practical foundations in Claude API / OpenAI API Basics. (25 lessons)
• LLM Engineering Foundations — Build practical foundations in LLM Engineering Foundations. (25 lessons)
• LLM Application Security — Build practical foundations in LLM Application Security. (25 lessons)
• Large Language Models — Build practical foundations in Large Language Models. (25 lessons)
• Machine Learning Basics — Build practical foundations in Machine Learning Basics. (25 lessons)
• MCP & Agent-to-Agent Protocols — Build practical foundations in MCP & Agent-to-Agent Protocols. (25 lessons)
• MLOps — Build practical foundations in MLOps. (25 lessons)
• AI Automation with n8n — Build practical foundations in AI Automation with n8n. (25 lessons)
• NumPy / Pandas / scikit-learn — Build practical foundations in NumPy / Pandas / scikit-learn. (25 lessons)
• OpenAI Agent Builder Workflows — Build practical foundations in OpenAI Agent Builder Workflows. (25 lessons)
• Prompt & Context Engineering — Build practical foundations in Prompt & Context Engineering. (25 lessons)
• Prompt Engineering — Build practical foundations in Prompt Engineering. (25 lessons)
• Prompt Quality Scoring — Build practical foundations in Prompt Quality Scoring. (25 lessons)
• RAG — Build practical foundations in RAG. (25 lessons)
• RAG Retrieval & Evaluation — Build practical foundations in RAG Retrieval & Evaluation. (25 lessons)
• Safe Autonomous Code Fixing — Build practical foundations in Safe Autonomous Code Fixing. (25 lessons)
• Apache Spark — Build practical foundations in Apache Spark. (25 lessons)

Tools & Developer Productivity

• Bun — Build practical foundations in Bun. (25 lessons)
• Debugging & Profiling — Build practical foundations in Debugging & Profiling. (25 lessons)
• Deno — Build practical foundations in Deno. (25 lessons)
• Docker Desktop — Build practical foundations in Docker Desktop. (25 lessons)
• Electron — Build practical foundations in Electron. (25 lessons)
• ESLint + Prettier — Master code quality and formatting with ESLint and Prettier. (25 lessons)
• Figma for Developers — Build practical foundations in Figma for Developers. (25 lessons)
• Jira / Linear & Agile Workflow — Build practical foundations in Jira / Linear & Agile Workflow. (25 lessons)
• Mailgun — Build practical foundations in Mailgun. (25 lessons)
• Markdown & Documentation — Build practical foundations in Markdown & Documentation. (25 lessons)
• Regular Expressions — Build practical foundations in Regular Expressions. (25 lessons)
• 1Password / Secrets Hygiene — Build practical foundations in 1Password / Secrets Hygiene. (25 lessons)
• Software Engineering Management — Build practical foundations in Software Engineering Management. (25 lessons)
• Tauri — Build practical foundations in Tauri. (25 lessons)
• Technical Risk Communication — Build practical foundations in Technical Risk Communication. (25 lessons)
• Technical Writing — Build practical foundations in Technical Writing. (25 lessons)
• Terminal Setup — Build practical foundations in Terminal Setup. (25 lessons)
• VS Code — Build practical foundations in VS Code. (25 lessons)
• Webpack — Master module bundling and build optimization. (25 lessons)

Career & Interview Prep

• Behavioural Interview Prep — Tell credible stories about how you work, learn and collaborate. (25 lessons)
• DSA Interview Patterns — Recognise common problem patterns and explain your solution clearly. (25 lessons)
• Freelancing & Remote Work Basics — Build a safe, professional and repeatable independent-work practice. (25 lessons)
• Open Source Contribution Guide — Learn to make respectful, reviewable contributions to real projects. (25 lessons)
• Resume & GitHub Portfolio — Present evidence of your skills clearly to recruiters and interviewers. (25 lessons)
• System Design Interview Prep — Practice structured, defensible design conversations for interviews. (25 lessons)