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Showing content from https://developer.mozilla.org/en-US/docs/Learn_web_development/Extensions/Async_JS below:

Asynchronous JavaScript - Learn web development

Asynchronous JavaScript

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In this module, we take a look at asynchronous JavaScript, why it is important, and how it can be used to effectively handle potential blocking operations, such as fetching resources from a server.

Prerequisites

Asynchronous JavaScript is a fairly advanced topic, and you are advised to work through Dynamic scripting with JavaScript modules before attempting this.

Note: If you are working on a computer/tablet/other device where you don't have the ability to create your own files, you can try out (most of) the code examples in an online coding program such as JS Bin or Glitch.

Tutorials and challenges

Introducing asynchronous JavaScript: In this article, we'll learn about synchronous and asynchronous programming, why we often need to use asynchronous techniques, and the problems related to the way asynchronous functions have historically been implemented in JavaScript.
How to use promises: Here we'll introduce promises and show how to use promise-based APIs. We'll also introduce the async and await keywords.
Implementing a promise-based API: This article will outline how to implement your own promise-based API.
Introducing workers: Workers enable you to run certain tasks in a separate thread to keep your main code responsive. In this article, we'll rewrite a long-running synchronous function to use a worker.
Sequencing animations ^Challenge: This challenge asks you to use promises to play a set of animations in a particular sequence.