Hi,

Have a look at the learning site: https://learning.intersystems.com
Please review below documentations as well:https://cedocs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=GCOS

https://cedocs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=GORIENT

Check this learning path:
learning paths for what you want such as Building Your First Application with Caché and Learn Caché for Developers.

Also check the video on how to start coding InterSystems Object Script with GitHub and VSCode on IRIS Community Edition. 

Thanks