Don't know how to run Phaser from scratch

I’m a complete novice. There’s loads of info on how to use it, but I can’t find out how to install it or even run it. I downloaded the zip files from GitHub and unzipped them. Now what??? Please could somebody tell me how to run or open Phaser. There’s no launcher in my Programs menu or in my Apps menu either. None of the unzipped files are .exe, so I am totally baffled. Please could somebody help (and use plain language, as I am clearly not an html person).
PS: I downloaded several other game engines in the same way and they have the same problem. Only one of them provided a useable launcher. Many thanks.

Phaser is just Javascript.
Javascript usually runs in a browser.
The browser needs something to serve it files. So you need a server.

If you are a complete newbie, the easiest thing to do is to start with an online editor (i.e. codesandbox), which does not require installing anything on your PC.
Here you have an example: admiring-flower-wipk4 - CodeSandbox

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