Developer References

Official Python 3 documentation, library reference, and language guide.

Mozilla's comprehensive JS reference covering syntax, APIs, and web standards.

Official TypeScript handbook, reference, and playground.

Official Go language documentation, tour, and standard library reference.

The Rust Programming Language book — free and official.

Oracle's official Java SE 21 documentation and API reference.

Microsoft's C# language guide, tutorials, and API browser.

Official Kotlin documentation with guides, reference, and coroutines.

Swift.org official docs and the Swift Programming Language book.

Official PHP manual with function reference and user contributed notes.

Core and standard library documentation for Ruby.

Comprehensive C and C++ language and standard library reference.

Official Scala documentation, tour, and API reference.

Official Elixir guides, mix docs, and hexdocs ecosystem.

Official React documentation with new docs, tutorials, and API reference.

Official Vue 3 guide covering composition API, reactivity, and components.

Google's Angular framework docs with guides and API reference.

Vercel's Next.js docs covering App Router, Pages Router, and deployment.

Official Svelte and SvelteKit documentation.

Official Astro docs for building content-driven websites.

Full-stack web framework docs focused on web standards and progressive enhancement.

Official Tailwind utility-first CSS framework documentation.

Next-generation frontend tooling docs — blazing fast build tool.

Official Nuxt 3 documentation for the Vue.js meta-framework.

Resumable JavaScript framework docs for instant-loading web apps.

Official Node.js API documentation and guides.

Express.js API reference and guide for building Node.js web apps.

Progressive Node.js framework docs — controllers, providers, modules.

Official Django documentation for Python's web framework.

Modern Python API framework docs with interactive examples.

Official Flask micro web framework documentation.

Official Spring Boot reference docs and getting started guides.

Official Laravel PHP framework documentation.

Official Rails guides covering ActiveRecord, routing, and more.

Official Gin HTTP web framework documentation for Go.

Official Actix Web framework docs for Rust.

Lightweight, fast web framework docs — works on any JS runtime.

Official PostgreSQL documentation covering SQL, configuration, and internals.

Official MySQL reference manual and getting started guides.

Official MongoDB docs covering CRUD, aggregation, indexing, and Atlas.

Official Redis documentation with commands, data types, and patterns.

Official SQLite documentation — the world's most deployed database.

Official Prisma ORM docs for TypeScript and Node.js.

Official Supabase docs — open source Firebase alternative with Postgres.

Lightweight TypeScript ORM docs for SQL databases.

Serverless MySQL platform documentation and branching workflow guide.

Official Apache Cassandra documentation for distributed NoSQL.

Official Neo4j graph database documentation and Cypher query language.

Amazon Web Services full documentation for all services.

Google Cloud Platform docs covering Compute, Storage, AI, and more.

Azure documentation with tutorials, quickstarts, and API reference.

Official Vercel docs — deployment, Edge Functions, and platform configuration.

Cloudflare developer docs — Workers, Pages, D1, R2, and more.

Official DigitalOcean documentation for Droplets, Apps, Kubernetes.

Official Netlify docs — deploy, Edge Functions, and forms.

Fly.io docs — run full-stack apps close to your users globally.

AWS best practices, reference architectures, and well-architected framework.

Google Cloud reference architectures, patterns, and best practices.

Official Docker documentation — containers, Compose, and Docker Hub.

Official Kubernetes docs — pods, services, deployments, and kubectl.

HashiCorp Terraform docs for infrastructure as code.

GitHub Actions docs — CI/CD workflows, runners, and marketplace.

Official Git documentation, reference manual, and Pro Git book.

GitHub platform docs — repos, pull requests, packages, and security.

Official Nginx documentation for web server and reverse proxy configuration.

Comprehensive Linux manual pages for commands and system calls.

Official Ansible automation documentation — playbooks, roles, and inventory.

Official Helm docs — the package manager for Kubernetes.

Official Prometheus monitoring system and time series database docs.

Official Grafana observability platform documentation.

Open source guide covering scalability, availability, CAP theorem, and common patterns.

System design interview prep with visual explanations and deep dives.

Site Reliability Engineering book by Google — free online.

Real-world architectures and case studies from companies at scale.

AWS framework for building secure, high-performing, resilient systems.

Patterns of Distributed Systems — detailed technical articles.

Designing Data-Intensive Applications by Martin Kleppmann — the definitive book.

Step-by-step system design learning roadmap with resources.

Popular course on system design interview preparation.

Complete reference for all Web APIs built into the browser.

Official GraphQL specification and learning guide.

Swagger/OpenAPI specification documentation for designing REST APIs.

Official gRPC documentation — protocol buffers, streaming, and language guides.

MDN WebSockets API reference and usage guide.

OAuth 2.0 framework documentation and flow diagrams.

Complete HTTP response status codes reference on MDN.

REST API concepts, constraints, and best practices guide.

Official JSON Schema specification and documentation.

Webhook security, implementation patterns, and provider examples.

Time and space complexity reference for common data structures and algorithms.

Curated LeetCode problems with video explanations, organized by pattern.

Harvard's free intro to computer science — hugely popular and beginner friendly.

MIT's Introduction to Algorithms course — lectures and problem sets free online.

Community-built developer roadmaps for frontend, backend, DevOps, and more.

Free, open source curriculum for learning full-stack web development.

Free coding curriculum with certifications — HTML, JS, Python, and more.

Comprehensive data structures and algorithms articles and practice problems.

Visualize algorithms and data structures through animations.

Free book covering computer science fundamentals from the ground up.

Official Claude API documentation — messages, tool use, and prompting guides.

Official OpenAI API docs covering completions, embeddings, and fine-tuning.

Hub docs for models, datasets, transformers library, and spaces.

Official LangChain docs for building LLM-powered applications.

Official LangChain.js docs for JavaScript and TypeScript.

Official TensorFlow documentation, tutorials, and API reference.

Official PyTorch documentation — tensors, autograd, and neural networks.

Practical deep learning for coders — free course and library docs.

Run large language models locally — model library and API reference.

Comprehensive guide to prompt engineering techniques and patterns.

Official React Native docs for building iOS and Android apps with React.

Official Flutter documentation from Google — widgets, state, and platform APIs.

Official Expo docs — the fastest way to build React Native apps.

Apple's official developer documentation for iOS, Swift, and Xcode.

Official Android developer guides, API reference, and Jetpack libraries.

Apple's official SwiftUI documentation for building iOS and macOS UIs.

Official Android Jetpack Compose documentation for modern Android UI.

Official VS Code documentation — editing, debugging, and extensions.

Official Chrome DevTools documentation for debugging web applications.

Official npm documentation for packages, CLI, and registry.

Official pnpm docs — fast, disk-space efficient package manager.

Official Bun documentation — fast all-in-one JavaScript runtime and toolkit.

Official Postman documentation for API testing and development.

Figma Dev Mode guide for inspecting designs and extracting code.

Online regex tester and debugger with detailed explanations.

Browser support tables for HTML, CSS, and JavaScript features.

Find the cost of adding an npm package to your bundle.

Google's web development learning resource — performance, accessibility, and more.