Visual Studio Code (often called VS Code) is a free software development environment that runs on Windows, Macs, and Linux computers. You can download it from the Visual Studio Code website. You might want to start with the Getting started with Visual Studio Code video (5 min), which talks you through downloading and installing the software, creating a simple file, and other basic information. The first 2 minutes and 20 seconds are the most relevant for our purposes. You can also find a link to Setup information in the left margin of the main VS Code website.
Your computer will choose where to install this software. It won't be in the class folder you created, though; that is for your own files you create for your assignments.)
Beautify: To install extensions, click on the Extensions icon in the left margin (looks a little like a square puzzle with one piece disconnected). In the Search text box, type Beautify, and then choose to Install it. You will find that Beautify is a super-handy tool to clean up the indentation in any files you create, making them much easier to read and modify correctly.