Async javascript is your only way to use data you are expecting to get at some point in the future.
We have three ways to do it: Callbacks - Promises (.then.catch) - Async/Await
I'm expecting you to have basic knowledge of javascript
=========For running code you can do one of those:=========
Run with a browser with an HTML page connected to your javascript file, or directly write your javascript code in the browser console
run it with Node.js
Use Code runner for your IDE, for VSCode I personally use this https://marketplace.visualstudio.com/...
For Pycharm it's built-in, I'm not sure about other IDEs and text editors
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