All Categories
Browse our comprehensive collection of references organized by topic
Programming Languages
Quick reference for popular programming languages
123 referencesWeb Development
HTML, CSS, JavaScript frameworks and tools
97 referencesDatabases & Data
SQL, NoSQL, and data manipulation
65 referencesTools & DevOps
Git, Docker, CLI tools and more
104 referencesDesign & Frontend
CSS Grid, Flexbox, design principles
18 referencesKeyboard Shortcuts
Speed up your workflow
12 referencesEditors & IDEs
Code editor shortcuts and configurations
16 referencesGames & Hobbies
Chess, photography, guitar and more
10 referencesOther Resources
Markdown, YAML, HTTP codes and more
8 referencesMobile Development
React Native, Flutter, Swift, Kotlin for mobile apps
8 referencesCloud & Infrastructure
Azure, GCP, serverless, cloud services
12 referencesSecurity & Networking
HTTPS, security best practices, networking protocols
12 referencesTesting & QA
Unit testing, Jest, Cypress, Selenium, testing frameworks
15 referencesAPI & Protocols
REST, GraphQL, WebSockets, gRPC, API design
14 referencesMachine Learning & AI
TensorFlow, PyTorch, scikit-learn, ML frameworks
14 referencesProject Management
Agile, Scrum, Jira, project management tools
18 referencesOperating Systems
Windows, macOS commands, PowerShell, system administration
16 referencesPerformance & Optimization
Caching, CDN, performance best practices
18 references