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AI
Agent tools, model workflows, and practical operating patterns
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Languages
Syntax, data, query, and markup references
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C Quick Reference Syntax, pointers, memory management, standard library essentials3 PDF Variants
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C++ Quick Reference Classes, templates, STL, smart pointers, modern C++ essentials3 PDF Variants
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C# Quick Reference Types, LINQ, async/await, collections, OOP essentials3 PDF Variants
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CSS Quick Reference Selectors, layout, flexbox, grid, animation, responsive design3 PDF Variants
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Dart Quick Reference Types, functions, classes, async, null safety, collections3 PDF Variants
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Go Quick Reference Syntax, types, concurrency, error handling essentials3 PDF Variants
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GraphQL Quick Reference Schemas, queries, mutations, types, fragments3 PDF Variants
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HTML & CSS Quick Reference Elements, selectors, flexbox, grid, responsive3 PDF Variants
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HTTP Status Codes Quick Reference Status codes, headers, and common response patterns3 PDF Variants
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Java Quick Reference OOP, collections, streams, exception handling essentials3 PDF Variants
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JavaScript Quick Reference ES6+ · DOM · Fetch · Async3 PDF Variants
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JSON Quick Reference Syntax, data types, objects, arrays, jq3 PDF Variants
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Kotlin Quick Reference Null safety, coroutines, data classes, functional programming essentials3 PDF Variants
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Lua Quick Reference Tables, functions, metatables, coroutines, modules, patterns3 PDF Variants
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Markdown Quick Reference Headings, links, images, code blocks, tables3 PDF Variants
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MATLAB Quick Reference Arrays, matrices, plotting, file I/O, control flow3 PDF Variants
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Matplotlib Quick Reference Figures, axes, plots, and customization3 PDF Variants
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NumPy Quick Reference Array creation, math, linear algebra, and more3 PDF Variants
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pandas Quick Reference DataFrames, selection, aggregation, merging, and more3 PDF Variants
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Perl Quick Reference Variables, regex, file I/O, references, modules essentials3 PDF Variants
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PHP Quick Reference Syntax, arrays, OOP, database, file I/O essentials3 PDF Variants
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Python 3 Quick Reference Basics through pandas, requests, csv, json3 PDF Variants
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PyTorch Quick Reference Tensors, autograd, neural networks, and training3 PDF Variants
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Regular Expressions Quick Reference Patterns, quantifiers, groups, lookaheads, flags3 PDF Variants
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Ruby Quick Reference Objects, blocks, iterators, regex, file I/O essentials3 PDF Variants
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Rust Quick Reference Ownership, types, traits, pattern matching essentials3 PDF Variants
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Sass/SCSS Quick Reference Variables, nesting, mixins, functions, control flow3 PDF Variants
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SQL Quick Reference SELECT, JOIN, subqueries, indexes, transactions3 PDF Variants
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Swift Quick Reference Types, optionals, protocols, error handling essentials3 PDF Variants
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TOML Quick Reference Tables, strings, numbers, dates, arrays3 PDF Variants
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TypeScript Quick Reference Types, interfaces, generics, utility types3 PDF Variants
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XPath Quick Reference Axes, predicates, functions, operators, node selection3 PDF Variants
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YAML Quick Reference Scalars, sequences, mappings, anchors, multi-line3 PDF Variants
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Tools
Version control, shells, containers, and workflows
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Alpine Linux Quick Reference Package management, services, networking, Docker base image3 PDF Variants
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AWK Quick Reference Patterns, fields, arrays, functions, text processing3 PDF Variants
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Bash Quick Reference Commands, scripting, pipes, redirection, job control3 PDF Variants
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Bitbucket Pipelines Quick Reference CI/CD pipelines, caching, artifacts, deployments3 PDF Variants
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chmod Quick Reference File permissions, numeric & symbolic modes, special bits, umask3 PDF Variants
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Chrome DevTools Quick Reference Elements, Console, Network, Performance, debugging3 PDF Variants
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Conventional Commits Quick Reference Commit message format, types, scopes, breaking changes3 PDF Variants
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Cron Quick Reference Job scheduling, crontab syntax, special strings, logging3 PDF Variants
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curl Quick Reference HTTP requests, headers, auth, forms, debugging3 PDF Variants
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Docker Quick Reference Containers, images, volumes, networking, compose3 PDF Variants
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Emacs Quick Reference Navigation, editing, buffers, search, org mode, packages3 PDF Variants
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Emmet Quick Reference HTML abbreviations, nesting, attributes, CSS shortcuts3 PDF Variants
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find Quick Reference File search by name, type, size, time, permissions, and actions3 PDF Variants
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Git Quick Reference Branches, merging, rebasing, stashing, remotes3 PDF Variants
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GitHub Actions Quick Reference Workflows, triggers, jobs, secrets, caching, artifacts3 PDF Variants
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GitHub CLI Quick Reference Repos, issues, PRs, actions, releases, API3 PDF Variants
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GitLab CI/CD Quick Reference Pipelines, jobs, stages, variables, artifacts, environments3 PDF Variants
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grep Quick Reference Pattern matching, regex, recursive search, context, filtering3 PDF Variants
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Homebrew Quick Reference Package management, casks, taps, services, cleanup3 PDF Variants
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Jest Quick Reference Tests, matchers, mocking, async, and snapshots3 PDF Variants
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Jira Quick Reference Issues, JQL, workflows, boards, sprints, filters3 PDF Variants
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Kubernetes Quick Reference kubectl, pods, deployments, services, configs, debugging3 PDF Variants
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LaTeX Quick Reference Document structure, math, tables, figures, and more3 PDF Variants
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MongoDB Quick Reference CRUD, queries, aggregation, indexes, schema design3 PDF Variants
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MySQL Quick Reference Databases, tables, CRUD, joins, indexes, users3 PDF Variants
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Neo4j / Cypher Quick Reference Graph database queries, nodes, relationships, patterns3 PDF Variants
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Nginx Quick Reference Server blocks, proxying, SSL, load balancing, logging3 PDF Variants
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nmap Quick Reference Port scanning, host discovery, service detection, and NSE scripts3 PDF Variants
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npm Quick Reference Package management, scripts, versioning, publishing, workspaces3 PDF Variants
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OpenSSL Quick Reference Certificates, keys, encryption, and debugging3 PDF Variants
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PostgreSQL Quick Reference Tables, queries, joins, indexes, JSON, roles3 PDF Variants
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PowerShell Quick Reference Cmdlets, pipeline, objects, scripting, modules3 PDF Variants
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Redis Quick Reference Strings, lists, sets, hashes, pub/sub, persistence3 PDF Variants
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GNU Screen Quick Reference Sessions, windows, splits, copy mode, and sharing3 PDF Variants
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sed Quick Reference Stream editing, substitution, addresses, hold space, in-place transforms3 PDF Variants
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Selenium WebDriver Quick Reference Browser automation, element interaction, waits, and assertions3 PDF Variants
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SSH Quick Reference Connections, keys, config, tunnels, SCP, SFTP3 PDF Variants
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Sublime Text Quick Reference Navigation, editing, multi-cursor, search, packages3 PDF Variants
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systemd Quick Reference Service management, units, timers, and journalctl3 PDF Variants
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Terraform Quick Reference Providers, resources, variables, state, modules3 PDF Variants
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tmux Quick Reference Sessions, windows, panes, copy mode, configuration3 PDF Variants
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Vim Quick Reference Modes, navigation, editing, search, macros, buffers3 PDF Variants
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VS Code Quick Reference Navigation, editing, multi-cursor, terminal, debugging, extensions3 PDF Variants
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Frameworks
Application frameworks and UI libraries
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Django Quick Reference Models, views, templates, ORM, forms, admin, auth3 PDF Variants
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Express.js Quick Reference Routing, middleware, requests, responses, patterns3 PDF Variants
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FastAPI Quick Reference Path operations, validation, dependencies, auth, testing3 PDF Variants
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Flask Quick Reference Routes, templates, requests, blueprints, database, extensions3 PDF Variants
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htmx Quick Reference Attributes, triggers, swapping, events, extensions3 PDF Variants
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jQuery Quick Reference Selectors, DOM, events, AJAX, effects, traversal3 PDF Variants
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Laravel Quick Reference Artisan, routing, Eloquent, Blade, middleware, auth3 PDF Variants
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React Quick Reference Components, hooks, state, effects, patterns3 PDF Variants
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Socket.IO Quick Reference Events, rooms, namespaces, middleware, real-time patterns3 PDF Variants
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Svelte Quick Reference Components, reactivity, stores, transitions, SvelteKit3 PDF Variants
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Vue.js Quick Reference Templates, reactivity, components, composition API, router3 PDF Variants
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WordPress Quick Reference Themes, hooks, queries, REST API, custom post types3 PDF Variants