I’m also a beginner with javascript and I struggled to get this running, but the trick is to find the examples folder on the web page and use browser-example.ts as your template. Use that code to create a javascript file to get the program started.
However, I only use Ring-Client-API for livestream since I could not get livestream working with Python Ring_Doorbell (see my post from Dec '19 in this thread). I use Python Ring_Doorbell to get battery %, timestamps, etc.
Hope this helps…