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
jq commands for filtering, transforming, and merging JSON: filters, pipes, select, map/reduce, path expressions, output formatting, plus jq 1.7 gotchas.
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, and reusable workflows.
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
Docker CLI quick reference — the commands you actually use: run, exec, build, compose up/down, volumes, networks, prune, images, and common debugging flags.
AWS CLI Cheat Sheet — EC2, S3 & IAM Quick Reference
AWS CLI quick reference: EC2, S3, IAM, Lambda, and CloudFormation commands with copy-paste examples, named profiles, and JMESPath --query filtering.
Data Formats & Patterns
OpenGraph Meta Tags Cheat Sheet — Sizes, Tags, Twitter Cards
Every OpenGraph and Twitter Card tag with recommended image sizes per platform (Facebook, LinkedIn, X, Slack, Discord) and a copyable HTML template.
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
Quick reference for regular expressions: character classes, quantifiers, anchors, lookaheads, and capture groups — with copy-paste examples for common matches.
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
PostgreSQL reference: CRUD, JOINs with visual diagrams, subquery vs JOIN vs CTE, 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.