Quick reference cards for developers, students, and power users. Copy commands, bookmark for later, or print for your desk.
Essential Linux commands for file management, processes, networking, and system administration
Variables, loops, conditionals, functions, and scripting patterns for Bash shell
Vim modes, navigation, editing, search, and plugin essentials
SSH connections, key management, SCP/SFTP transfers, tunnels, and security hardening
Complete Git reference: init, branching, merging, rebasing, stashing, and remote operations
Modern JavaScript syntax: destructuring, arrow functions, promises, modules, and built-in methods
Python syntax, data structures, comprehensions, built-in functions, and common patterns
Regex syntax, character classes, quantifiers, groups, lookaheads, and common patterns
SELECT, JOIN, GROUP BY, subqueries, indexes, and database manipulation commands
Types, interfaces, generics, utility types, type guards, and advanced TypeScript patterns
Package management: install, update, publish, scripts, audit, and configuration
Strings, hashes, lists, sets, sorted sets, pub/sub, streams, and transactions
MySQL queries, joins, indexes, user management, and database administration
useState, useEffect, useRef, useMemo, React 19 hooks, and custom hook patterns
Flex container and item properties, alignment, ordering, and common layout patterns
Grid container and item properties, template areas, auto-placement, and responsive grids
Complete HTTP status code reference: 1xx informational through 5xx server errors
Docker CLI, container management, images, volumes, networks, and Docker Compose
kubectl essentials: pods, deployments, services, secrets, scaling, debugging, and RBAC
Virtual hosts, modules, SSL, .htaccess, reverse proxy, and performance tuning
Server blocks, reverse proxy, SSL, load balancing, caching, and rate limiting
S3, EC2, IAM, Lambda, ECS, CloudFormation, and essential AWS CLI commands
Infrastructure as Code: init, plan, apply, state management, workspaces, and modules
Headings, formatting, links, images, code blocks, tables, and GitHub-flavored markdown
Essential VS Code keyboard shortcuts for editing, navigation, debugging, and extensions