Each time you need to access data or load a resource from a server in JavaScript, you enter the realm of asynchronous code. This holds true whether you use an Aura action, a Lightning web component wire, an XHR call or a Fetch call. Watch this session to get an understanding of the different patterns that let you handle sequential or parallel calls. You’ll learn about callbacks, promises and async/await.
Trailhead Live: https://trailhead.salesforce.com/live/videos/a2r3k0000014vPp/understanding-asynchronous-javascript
GitHub repo: https://github.com/pozil/async-lwc-demo