Visual Studio and Visual Studio Code are very different. You want Visual Studio Code, which is a light weight text/code editor. Can be used for any text related editing. It has tons of extensions, like the ones NYC CNC shows, that are related to Fusion 360’s Post Processor and in general G-Code (NC). Can also be used for other [code] languages and is supported on Windows, Mac and Linux.
Visual Studio, what @will linked to, is a whole different animal, that is a full fledged IDE (Integrated Development Environment) meant for developing and debugging applications in C, C#, VB.NET and some other languages, which also as add-ins. Don’t use this for G-Code or Post Processor editing, it is WAY overkill for that type of editing. Also the VS Code extensions don’t work with Visual Studio, and is only supported on Windows.
P.S. Visual Studio for Mac, is also not what you want, that is the full fledged IDE of Visual Studio but for Mac to do .NET Core and Mono development (along with C and other languages)
P.P.S. None are related to Fusion360 or AutoDesk in general, they are products from Microsoft.