Quick reference guides for developers and designers. Essential commands, syntax, and best practices all in one place.
Custom properties, theming, dynamic values, and design token patterns
Selector types, combinators, pseudo-classes, pseudo-elements, and specificity
Complete reference for CSS Grid layout with examples and common patterns
Essential Flexbox properties and values with practical examples
Keyframes, transitions, transforms, and animation properties
Color formats, gradients, filters, and color manipulation
Type annotations, interfaces, generics, utility types, and tsconfig options
useState, useEffect, useRef, useMemo, useCallback, and custom hooks
App Router conventions, layouts, server components, and data fetching patterns
Modern JavaScript features: arrow functions, destructuring, modules, and more
Essential DOM methods, events, and manipulation techniques
Promises, async/await, callbacks, and error handling
Variables, data types, control flow, functions, and OOP fundamentals
Lists, dicts, sets, tuples, comprehensions, and collections module
Regular expressions in Python: re module, patterns, groups, and flags
Essential Git commands for daily development workflow
Advanced Git operations: rebasing, cherry-picking, and troubleshooting
Common Git workflows: feature branches, releases, and collaboration
Images, containers, volumes, networks, and Docker Compose essentials
npm CLI, scripts, semver, workspaces, and package.json fields
chmod, chown, umask, ACLs, and permission notation explained
Essential keyboard shortcuts for editing, navigation, debugging, and the terminal
Modes, motion commands, editing, buffers, and essential Vim keybindings
Essential Unix/Linux commands for file management and system operations
Windows CMD and PowerShell commands for system administration
PostgreSQL queries, indexes, JSON functions, CTEs, and window functions
Strings, hashes, lists, sets, sorted sets, pub/sub, and expiry commands
Essential SQL commands: SELECT, INSERT, UPDATE, DELETE, and JOINs
MongoDB shell commands and aggregation pipeline examples
HTTP verbs, status code ranges, common codes, and headers reference
Resource naming, HTTP methods, pagination, versioning, and error responses
Headings, lists, links, images, tables, code blocks, and GitHub-flavored Markdown
JSON data types, structure, schema validation, and common patterns
Semantic HTML tags and their proper usage for accessibility
WCAG 2.1 guidelines and implementation checklist
Core Web Vitals, optimization techniques, and performance metrics
Breakpoints, media queries, and responsive design patterns
Service workers, manifest files, and PWA implementation