Free Cheat Sheets for HTML, CSS, JavaScript, PHP, SQL, Git, Linux and Security
One-page quick references for the languages, commands and terms you use every day. Read them online, print them, or download a PDF to keep next to your keyboard.
Web languages
Cheat sheet · 85 entries
HTML Cheat Sheet
Every everyday HTML tag and attribute on one page: structure, text, media, tables, forms, semantic layout, meta tags and accessibility.
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Cheat sheet · 89 entries
CSS Cheat Sheet
Selectors, the box model, units, flexbox, grid, positioning, responsive design, custom properties and transitions on one page.
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Cheat sheet · 100 entries
JavaScript Cheat Sheet
Modern JavaScript at a glance: variables, operators, strings, arrays, objects, functions, the DOM, fetch with async/await, modules and errors.
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Cheat sheet · 109 entries
PHP 8.3 Cheat Sheet
PHP 8.3 syntax on one page: types, strings, arrays, match, functions, OOP, forms, sessions, PDO, password hashing and errors.
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Databases
Cheat sheet · 96 entries
MySQL Cheat Sheet
MySQL commands on one page: the CLI, tables and data types, CRUD, joins, GROUP BY, indexes, users and grants, backups and transactions.
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Cheat sheet · 56 entries
SQL Query Examples by Task
Practical SQL query examples on one small schema: filtering, pagination, joins, aggregates, subqueries, CTEs, window functions, upserts and dates.
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Tools and troubleshooting
Cheat sheet · 97 entries
Git Commands Cheat Sheet
Everyday Git commands on one page: setup, branching with switch and restore, merging, rebasing, remotes, safe undo, stash, tags and .gitignore.
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Cheat sheet · 59 entries
PHP Errors and Fixes Cheat Sheet
Common PHP 8 error messages with their usual cause and fix: parse errors, warnings, fatal and type errors, PDO, sessions, headers and limits.
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Cheat sheet · 111 entries
Linux Commands Cheat Sheet
Essential Linux commands for files, permissions, users, processes, services, apt and dnf packages, networking, searching, archives and disk space.
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Networking and security
Cheat sheet · 65 entries
Common Network Ports Cheat Sheet
Standard TCP and UDP port numbers for web, email, remote access, DNS, DHCP, management, VPN and databases, grouped by category.
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Cheat sheet · 83 entries
Cybersecurity Glossary Cheat Sheet
Around 80 cybersecurity terms in plain English: attacks, malware, defences, cryptography, identity, network security, CERT-In and the DPDP Act.
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