Master JavaScript variables, data types, operators, control flow, and function fundamentals.

Manipulate the DOM, handle events, use localStorage, and interact with browser APIs.

Write modern JS with arrow functions, destructuring, spread/rest, modules, and the latest ES features.

Master the event loop, callbacks, Promises, async/await, and the Fetch API.

Understand closures, `this` binding, the prototype chain, ES6 classes, and OOP patterns in JavaScript.