Developer Cheatsheets
Quick-reference guides for everyday developer workflows.
CLI Tools
Nginx Cheat Sheet — Server Blocks, Proxy & SSL
Quick reference for Nginx: service management, server blocks, reverse proxy, load balancing, SSL/TLS, location matching, logging, and performance tuning.
tmux Cheat Sheet — Sessions, Windows, Panes & Copy Mode
Quick reference for tmux: sessions, windows, panes, copy mode, resizing, synchronize panes, configuration, and keybindings.
Bash Scripting Cheat Sheet
Quick reference for Bash scripting: variables, parameter expansion, conditionals, loops, functions, arrays, redirection, error handling, and strict mode.
curl Cheat Sheet — HTTP Requests & API Testing
Quick reference for curl: GET/POST requests, headers, cookies, authentication, file uploads and downloads, debugging, TLS, proxies, and scripting patterns.
jq Cheat Sheet — Filter & Transform JSON
Quick reference for jq: basic filters, pipes, selectors, string operations, array and object manipulation, reduce, path expressions, output formatting, and passing variables.
SSH Cheat Sheet
Quick reference for SSH: connecting, key generation, agent, port forwarding, jump hosts, SCP, SFTP, config file, and permissions.
Python Cheat Sheet — Quick Reference
Python quick reference: data types, string methods, list/dict comprehensions, f-strings, file I/O, and common standard library modules.
JavaScript Cheat Sheet — ES6+ Quick Reference
JavaScript ES6+ quick reference: destructuring, spread operator, arrow functions, array methods, promises, async/await, and modules.
TypeScript Cheat Sheet — Types & Generics Quick Reference
TypeScript quick reference: basic types, interfaces, generics, utility types, type guards, enums, and type assertions.
Go (Golang) Cheat Sheet — Quick Reference
Go quick reference: types, structs, interfaces, goroutines, channels, error handling, slices, maps, and defer/panic/recover.
Rust Cheat Sheet — Ownership & Types Quick Reference
Rust quick reference: ownership, borrowing, lifetimes, traits, enums, pattern matching, Result/Option, and common macros.
Linux Commands Cheat Sheet — Quick Reference
Linux commands quick reference: file management, process control, networking, permissions, systemd, and disk usage.
DevOps & Infrastructure
GitHub Actions Cheat Sheet
Quick reference for GitHub Actions CI/CD: workflow syntax, triggers, jobs, matrix strategies, secrets, caching, artifacts, reusable workflows, and essential actions.
Terraform Cheat Sheet
Quick reference for Terraform CLI commands, HCL configuration syntax, state management, workspaces, expressions, and built-in functions.
Kubernetes (kubectl) Cheat Sheet
Quick reference for kubectl: contexts, core resources, pod operations, deployments, scaling, debugging, ConfigMaps, and Secrets.
Docker Cheat Sheet
Quick reference for Docker CLI: containers, images, volumes, networking, and Docker Compose.
AWS CLI Cheat Sheet — EC2, S3 & IAM Quick Reference
AWS CLI quick reference: EC2, S3, IAM, Lambda, and CloudFormation common commands with examples.
Data Formats & Patterns
HTTP Status Codes — Complete Quick Reference
Every HTTP status code explained with practical examples. 1xx through 5xx with when to use each code in your API.
YAML Syntax Cheat Sheet — Scalars, Collections & Gotchas
Quick reference for YAML syntax: strings, numbers, multiline values, sequences, mappings, anchors, aliases, and common gotchas like the Norway problem.
JSON Cheat Sheet — Syntax, Parsing & Common Mistakes
Quick reference for JSON syntax: data types, objects, arrays, JSON.parse/stringify, jq basics, and common mistakes like trailing commas and single quotes.
Regex Cheat Sheet for Developers
A quick-reference guide to regular expression syntax: patterns, quantifiers, groups, and examples.
CSS Cheat Sheet — Flexbox, Grid & Selectors Quick Reference
CSS quick reference: Flexbox, Grid, selectors, units, CSS variables, media queries, and transitions.
Markdown Cheat Sheet — Syntax Quick Reference
Markdown syntax quick reference: headings, links, images, lists, code blocks, tables, and GitHub Flavored Markdown extensions.
Version Control
Databases
PostgreSQL Cheat Sheet
Comprehensive PostgreSQL reference: CRUD, JOINs with visual diagrams, subquery vs JOIN vs CTE alternatives, window functions, indexing, JSONB, transactions, and performance tuning.
SQL Cheat Sheet — Queries & Commands Quick Reference
SQL quick reference: SELECT, JOINs, GROUP BY, subqueries, window functions, indexes, and data manipulation commands.
MySQL Cheat Sheet — Commands & Queries Quick Reference
MySQL quick reference: data types, CRUD operations, JOINs, indexes, user management, backup/restore, and common functions.
Networking & Scheduling
CIDR Notation Cheat Sheet — Subnet Masks & Host Counts
Complete CIDR reference table: every prefix from /8 to /32 with subnet mask, total addresses, usable hosts, and common use cases.
Cron Schedule Examples — 30+ Common Cron Expressions
Ready-to-use cron expressions for every common schedule: every 5 minutes, hourly, daily, weekly, monthly, and more.
Editors
Neovim Cheat Sheet
Essential Neovim commands and keybindings: modes, navigation, editing, text objects, search, windows, buffers, macros, and more.
Vim Cheat Sheet — Commands & Motions Quick Reference
Vim quick reference: modes, navigation, editing, search/replace, visual mode, registers, macros, and window management.