Which is the best Software to develop for AR App

Hi good morning, I am newbie in Unity and I am using Unity 2022.3.3f1
I would like to start to develop AR experiences. I have read about AR Foundation or Vuforia, but any of those develop for Web or PC and I don’t know how to start. I would like to do projects like theses I have found in this webpage:

Could anyone explain how I could start? Which SDK’s I should use and which one is better for performance and to develop in several platforms. I would like to develop to PC,
Android, IOS and WebGL. Any SDK, APi or whatever to start? Thank you!