Quick reference guides for programming languages, tools, and applications
Python syntax, built-in functions, and common patterns
JavaScript syntax, DOM, async patterns, and ES6+ features
TypeScript types, interfaces, and patterns
React components, hooks, state management, and patterns
Go syntax, concurrency, interfaces, and standard library
Rust ownership, lifetimes, traits, and cargo commands
MATLAB commands, functions, and syntax
SQL queries, joins, and database operations
C/C++ syntax, pointers, STL, and modern C++ features
Java OOP, Collections, Streams, and functional interfaces
C# LINQ, async/await, pattern matching, and .NET
Swift optionals, protocols, concurrency, and SwiftUI
Kotlin null safety, coroutines, and scope functions
Next.js App Router, Server Components, and data fetching
Vue.js Composition API, Vue Router, and Pinia
Svelte reactivity, stores, and SvelteKit
Tailwind CSS utility classes and responsive design
Node.js core modules, npm, and ES modules
HTML elements, attributes, and semantic markup
CSS selectors, Flexbox, Grid, and SCSS syntax
PHP syntax, arrays, OOP, and web development
Ruby syntax, blocks, iterators, and metaprogramming
Scala functional programming, case classes, and implicits
R statistical computing, data frames, and visualization
Dart syntax, async/await, and Flutter development
Elixir functional programming, OTP, and Phoenix
Lua tables, metatables, and scripting
Perl regex, text processing, and one-liners
Angular components, services, and RxJS
Express.js routing, middleware, and REST APIs
NestJS controllers, providers, and decorators
Rails MVC, ActiveRecord, and generators
GraphQL queries, mutations, and schemas
Haskell functional programming and monads
Nuxt.js Vue framework and SSR
SolidJS reactive UI library
htmx HTML-driven interactivity
Visual Studio Code shortcuts and extensions
PyCharm IDE shortcuts and features
Jupyter Notebook shortcuts and magic commands
IntelliJ IDEA shortcuts and productivity features
Neovim commands, Lua config, and plugins
Emacs commands, shortcuts, and Elisp
Git version control commands and workflows
Docker container and image management commands
Kubernetes kubectl commands, pods, deployments, and services
AWS CLI commands for EC2, S3, IAM, Lambda, and more
GitHub Actions workflows, triggers, jobs, and deployments
Essential Linux terminal commands and shortcuts
Bash shell scripting syntax and commands
Nginx web server configuration and commands
Vim text editor commands and shortcuts
Makefile syntax, variables, and pattern rules
Pytest fixtures, markers, and test patterns
Windows keyboard shortcuts, CMD, and PowerShell commands
npm, yarn, pnpm, pip, and Homebrew commands
macOS keyboard shortcuts and system commands
Terraform HCL, providers, and state management
Ansible playbooks, modules, and inventory
Helm charts, templates, and Kubernetes deployment
Jenkins pipelines, jobs, and CI/CD automation
Prometheus metrics, PromQL, and alerting
Grafana dashboards, panels, and data sources
Zsh shell features, Oh My Zsh, and plugins
Fish shell commands and configuration
PowerShell cmdlets, scripting, and automation
Argo CD GitOps continuous delivery
Traefik reverse proxy and load balancer
Azure CLI cloud management commands
gcloud CLI commands for Google Cloud Platform
tmux terminal multiplexer sessions and panes
jq JSON processor and filters
sed stream editor for text processing
awk text processing and pattern scanning
Airflow workflow orchestration and DAGs
NumPy array operations, linear algebra, and scientific computing
Pandas DataFrame operations, selection, aggregation, and time series
PyTorch tensors, neural networks, and deep learning
TensorFlow and Keras deep learning framework
Matplotlib data visualization and plotting
PostgreSQL queries, functions, administration, and performance
MySQL database queries, administration, and optimization
MongoDB CRUD, aggregation, indexes, and administration
Redis data structures, commands, pub/sub, and clustering
Elasticsearch search, aggregations, and cluster management
Scikit-learn ML algorithms, preprocessing, and pipelines
OpenCV image processing, filters, and computer vision
Apache Spark DataFrame, SQL, and data processing
SQLite queries, CLI, and embedded database
Supabase database, auth, and real-time APIs
Neo4j graph database and Cypher queries
Kafka message streaming and producers/consumers
RabbitMQ message broker and queues
Regular expressions patterns, quantifiers, groups, and lookarounds
Markdown syntax, formatting, tables, and GitHub extensions
LaTeX document typesetting, math, and formatting
SSH keys, tunnels, GPG encryption, and Git signing
curl commands, HTTP methods, headers, authentication, and APIs
reStructuredText markup, directives, and Sphinx
Postman API testing, collections, and environments
FFmpeg video/audio processing and conversion
ImageMagick image processing and conversion
ripgrep fast search, patterns, and options
fzf fuzzy finder and shell integration
Cadence Virtuoso IC design shortcuts and SKILL commands
Synopsys Design Compiler, PrimeTime, VCS, and ICC2
Verilog and VHDL hardware description languages
LTSpice circuit simulation and SPICE commands
KiCad PCB design, schematic capture, and routing