Master JavaScript from basics to advanced
ECMAScript is the official standard behind JavaScript. Learn how ECMAScript works, what TC39 does, and how the language specification has evolved from ES1 to the yearly release cycle.
Master Chrome DevTools to write, run, and debug JavaScript directly in the browser. Learn the Console, Sources panel, Snippets, and breakpoints.
Learn the two ways to write comments in JavaScript: single-line comments and block comments. See clear examples and know when to use each style.
Good comments explain why, not what. Learn the commenting habits that make JavaScript code easier to read, maintain, and debug without cluttering your files.
Learn how to use console.group, console.groupCollapsed, and console.groupEnd to organize your console output into collapsible sections that are easier to read and debug.
Learn the essential debugging workflow every JavaScript beginner needs: reading error messages, using console.log strategically, and isolating problems one step at a time.
Understand how JavaScript's Automatic Semicolon Insertion works, when it helps, and when missing semicolons can still surprise you.
Learn what JavaScript strict mode is, how to enable it with 'use strict', and how it catches silent mistakes that would otherwise go unnoticed.
Learn the JavaScript variable naming rules and conventions that help beginners write readable code.
Learn beginner-friendly JavaScript code style rules for indentation, semicolons, naming, comments, and consistent formatting.
Variables are named containers that store data in your code. Learn what JavaScript variables are, how to create them, and how to use them with clear examples.
Learn how to check if a JavaScript string contains, starts with, or ends with a substring using includes, startsWith, and endsWith with practical examples.
