Cheat Sheets

Quick reference for JSON syntax, data types, escaping, and common pitfalls — with examples.

Quick reference for YAML scalars, collections, anchors, block styles, and indentation pitfalls.

Modern JavaScript quick reference: types, arrays, objects, destructuring, promises, and common idioms.

Quick reference for CSS selectors: basic, attribute, pseudo-classes, pseudo-elements, and combinators.

Quick reference for Vim modes, movement, editing, search, and the commands developers use most.

Quick reference for Bash: variables, redirection, pipes, conditionals, loops, and one-liners.

Essential Git commands: setup, staging, branching, merging, undo, and remote workflows.

Docker CLI reference: images, containers, volumes, networks, Compose, and cleanup.

curl flags and patterns: methods, headers, auth, data, cookies, and common API calls.

grep patterns and flags: literal/regex search, inversion, context, files, and one-liners.

GNU find reference: by name/type/size/time, actions, exec, and prune patterns.

Modern Python quick reference: data types, comprehensions, strings, files, and common idioms.

Regex reference: anchors, character classes, quantifiers, groups, lookaround, and common patterns.

Linux file permissions: symbolic and octal modes, common combos, and pitfalls.

Crontab syntax reference: fields, special strings, ranges, and common schedules.

awk one-liners: fields, patterns, actions, FS/OFS, and common text-processing recipes.

Conventional Commits spec: types, scope, breaking changes, and examples.

Markdown reference: headings, emphasis, lists, links, code, tables, and extensions.

HTML reference: structure, semantics, forms, accessibility, and common elements.

HTTP response status codes: 1xx–5xx classes, common codes, and when to use them.

ASCII reference: printable characters, control codes, and decimal/hex/octal values.