Resources

Cheat sheetsThe command you forgot, in one place

Nobody remembers every flag. These pages are the ones worth keeping open in a tab: grouped by what you are trying to achieve rather than alphabetically, so you can find the command from the problem instead of the other way round.

Every entry is checked against the current version of the tool, and says so when a command needs a recent release. Nothing here asks you to sign up.

Matcha

From the Pinboard

23 cheat sheets in 6 topics

Web development

5 cheat sheets

The languages every web page is built from: markup, styling and scripting for the browser, and the patterns that go with them.

JavaScript

JavaScript syntax on one page: variables, array methods, destructuring, classes, modules, async/await, fetch and the DOM, checked against ES2025.

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TypeScript

TypeScript on one page: types, interfaces, unions and narrowing, generics, utility types, enums, satisfies and tsconfig, checked with TypeScript 7.

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HTML

HTML on one page: document skeleton, semantic elements, links, images, tables, forms and input types, meta tags and ARIA, checked against the HTML standard.

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CSS

CSS on one page: selectors and specificity, box model, units, flexbox, grid, colours, animations and container queries, with browser support as of 2026.

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Regex

Regex on one page: character classes, anchors, greedy and lazy quantifiers, named groups, lookarounds, flags and tested patterns, for JavaScript ES2025.

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Scripting and data

5 cheat sheets

Automating everyday jobs, querying and analysing data, and getting around the command line.

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Python

Python syntax on one page, grouped by what you are trying to do: f-strings, dicts, comprehensions, dataclasses, files and venvs, checked against Python 3.14.

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SQL

SQL syntax on one page: SELECT, WHERE, the four JOINs, GROUP BY, window functions, CTEs and upserts, with PostgreSQL, MySQL and SQLite differences noted.

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Bash

Bash syntax on one page: variables, quoting, parameter expansion, [[ ]] tests, loops, arrays, redirection and set -euo pipefail, checked against Bash 5.3.

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Linux Commands

Linux commands on one page: files, permissions, find, grep, sed, awk, processes, disk, ssh, curl, apt and tar, each one run on Ubuntu 24.04 LTS.

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R

R syntax on one page: vectors, data frames, indexing, the apply family, dplyr verbs, ggplot2 and reading CSV files, checked against R 4.6 and the tidyverse.

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Compiled and systems languages

6 cheat sheets

Languages you compile before you run: types, memory, the standard library and the build commands, one language at a time.

C

C syntax on one page, grouped by what you are trying to do: pointers, strings, structs, malloc and free, the preprocessor and gcc flags, checked on C23.

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C++

C++ syntax on one page, grouped by what you are trying to do: classes, smart pointers, templates, STL containers, lambdas and move semantics, on C++23.

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Java

Java syntax on one page, grouped by what you are trying to do: collections, records, generics, streams, Optional and exceptions, checked on Java 25.

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C#

C# syntax on one page, grouped by what you are trying to do: LINQ, records, properties, async/await and pattern matching, checked on C# 14 and .NET 10.

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Go

Go syntax on one page, grouped by what you are trying to do: slices, maps, structs, interfaces, errors, goroutines and channels, checked on Go 1.27.

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Rust

Rust syntax on one page, grouped by what you are trying to do: ownership and borrowing, enums and match, traits, iterators and errors, checked on Rust 1.98.

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Programming languages

5 cheat sheets

Syntax, standard library and the gotchas for one language at a time, checked against its current release.

PHP

PHP syntax on one page, grouped by what you are trying to do: strings, arrays, classes, match, PDO queries and Composer, checked against PHP 8.5.

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Ruby

Ruby syntax on one page, grouped by what you are trying to do: strings, hashes, blocks, classes, pattern matching and Bundler, checked against Ruby 4.0.

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Swift

Swift syntax on one page, grouped by what you are trying to do: optionals, closures, structs vs classes, protocols and async/await, checked against Swift 6.4.

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Dart

Dart syntax on one page, grouped by what you are trying to do: null safety, collections, patterns, classes and mixins, async and streams, checked on Dart 3.13.

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Lua

Lua syntax on one page, grouped by what you are trying to do: tables, string patterns, metatables, modules and coroutines, checked against Lua 5.5.

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Version control

1 cheat sheet

Tracking changes, branching, merging and undoing mistakes without losing work.

Git

Every Git command worth keeping close, grouped by what you are trying to do: commit, branch, merge, undo a mistake, and dig through history.

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Containers

1 cheat sheet

Packaging an application with everything it needs to run, so it behaves the same on every machine.

Docker

Every Docker command worth keeping close, grouped by what you are trying to do: run a container, build an image, mount a volume, and clear up the mess.

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On the list: Vim, VS Code shortcuts. Want one of them sooner? Tell us.