Cheat Sheet

A checklist of items to verify before launching a web page across HTML, CSS, JS, accessibility, performance and SEO, with priority labels. in Web & Frontend →

A community-run accessibility site with a plain checklist based on WCAG, articles and lists of tools and resources. in Web & Frontend →

The W3C’s “How to Meet WCAG” page: every success criterion, its level (A, AA, AAA), the techniques that satisfy it and… in Web & Frontend →

Ready CSS recipes for common layouts and components (cards, centring, sticky header). in CSS & UI Kits →

A checklist to review before running Kubernetes in production: resource limits, health checks, networking, security and observability. in DevOps & Infrastructure →

A collection of ways to do things with Bash’s own facilities instead of calling external programs, which speeds scripts… in Networking & Sysadmin →

Payloads and bypass notes for web security and CTFs, organised by vulnerability class (SQLi, SSRF, XXE, SSTI and more). in Offence, Defence & OSINT →

The SANS Institute’s security cheat sheets: forensics, incident response, memory analysis, the Windows registry. in Offence, Defence & OSINT →

A single page listing web application security tests as a mind map; each branch is a test area with its tools. in Offence, Defence & OSINT →

A continually updated cheat sheet of the commands and techniques the OSCP exam most often needs. in Certification & Career →

A cheat sheet mapping mathematical notation to readable code: sigma sums, dot products. in Mathematics →

A cheat sheet compressing a probability course’s distributions, expectations and theorems onto one page. in Mathematics →

A single colour-coded table of time and space complexity for data structures and sorting algorithms. in Practice & Challenges →

A single-table reference for the time and space complexity of data structures and sorting algorithms. in Cheat Sheets & Quick Reference →

Cheat sheets for languages, frameworks and command-line tools, each condensed into a single file. in Cheat Sheets & Quick Reference →

A directory collecting cheat sheets scattered across the web, filed by subject. in Cheat Sheets & Quick Reference →

Pulls a cheat sheet from the terminal with curl cheat.sh/command. in Cheat Sheets & Quick Reference →

An archive of user-made cheat sheets, each printable as a PDF. in Cheat Sheets & Quick Reference →

An appendix comparing open-source licences in one table of permissions, conditions and limitations. in Cheat Sheets & Quick Reference →

A dense single-page summary of Python syntax, collections, the standard library and common modules. in Cheat Sheets & Quick Reference →

An archive of one-page cheat sheets for hundreds of tools and languages. in Cheat Sheets & Quick Reference →

A single-page cheat sheet of common Git commands, grouped by task. in Cheat Sheets & Quick Reference →

A catalogue of commonly needed regular expressions (email, phone, dates, IP addresses), each with a diagram, an explanation and a place to try it. in Cheat Sheets & Quick Reference →

Introduces a language through a single annotated file. in Cheat Sheets & Quick Reference →

GitHub’s official summary of its own Markdown dialect: tables, task lists, code fences, mentions. in Cheat Sheets & Quick Reference →

A directory gathering language and framework cheat sheets on one page. in Cheat Sheets & Quick Reference →

Short, implementation-focused guides on application security topics such as authentication, injection prevention and session management. in Cheat Sheets & Quick Reference →

A filterable list of XSS vectors by tag, event handler and browser. in Cheat Sheets & Quick Reference →

A recipe collection for doing string, array, file and loop work in pure POSIX sh without calling external commands like sed, awk or cut. in Cheat Sheets & Quick Reference →

A Python reference based on "Automate the Boring Stuff", covering syntax through the standard library. in Cheat Sheets & Quick Reference →

One-page cheat sheets for languages and tools, surfacing the common cases. in Cheat Sheets & Quick Reference →

A compact collection of command-line tips split into everyday, advanced and situational sections, translated into dozens of languages. in Cheat Sheets & Quick Reference →

A widely used single-repo compilation of manuals, cheat sheets, one-liners and CLI/web tools for sysadmins, DevOps and security work. in Cheat Sheets & Quick Reference →

Community-simplified man pages for command-line tools. in Cheat Sheets & Quick Reference →

A classic one-page reference to Unix/Linux administration commands: networking, filesystems, processes, SSH, security. in Cheat Sheets & Quick Reference →

A one-page list of Vim commands grouped by category, translated into a dozen languages. in Cheat Sheets & Quick Reference →