Cheat Sheets

Quick reference for cron expression syntax: fields, special characters, common schedules, and platform differences (Linux, GitHub Actions, AWS, Quartz).

JSONPath quick reference for root paths, property selectors, array indexes, wildcards, recursive descent, unions, and slices supported by the OCMA tester.

SQL query reference: SELECT, JOINs, aggregation, subqueries, CTEs, window functions, data modification, and schema commands with practical examples.

Complete Markdown syntax reference: headings, emphasis, lists, links, images, code blocks, tables, task lists, and GFM extensions.

Regular expression quick reference: character classes, anchors, quantifiers, groups, lookahead/lookbehind, flags, and common patterns.

Quick-reference guide to the most common Git commands — configuration, branching, merging, remote operations, undoing changes, stashing, and inspection.

Complete CSS selectors reference: basic selectors, combinators, attribute selectors, pseudo-classes, pseudo-elements, modern selectors (:is, :where, :has), and specificity.

Complete HTML reference: document structure, text tags, links, media, lists, tables, forms, inputs, and semantic HTML5 elements.

CSS Flexbox layout reference: container properties, item properties, alignment values, common patterns, and the flex shorthand.

Unix file permissions reference: octal values, symbolic notation, common chmod values, special bits (SUID, SGID, sticky), and useful commands.

JSON Web Token reference: token structure, header fields, standard claims, signing algorithms, security best practices, and common errors.

Comprehensive JavaScript reference covering variables, types, strings, arrays, objects, functions, promises, async/await, and modern ES6+ syntax.

Visual Studio Code keyboard shortcuts quick reference: editing, multi-cursor, navigation, find & replace, terminal, debugging, refactoring, snippets and settings.