JavaScript, from basics to async: everything I learned and how it finally clicked

A structured walkthrough of JavaScript fundamentals, from variables and data types to closures, the event loop, and async/await.

The author distilled long-form course notes into a clearer explanation of how JavaScript actually works under the hood.

It focuses on concepts that often trip up learners, including scope, references, the `this` keyword, callbacks, and promises.

The piece also connects these basics to modern usage across ECMAScript, Node.js, React Native, and Electron.