An example and terms of reference for the online training section on 1C-Bitrix?

Question

Computer networks

Hello.
I am looking for examples of online training courses for external users on 1C-Bitrix.
Is there anyone here who can show or give a link to examples of sites with such functionality (I understand that the 1C-Bitrix site itself with courses is such an example) , then I will be grateful.
Perhaps someone can share the terms of reference for the development of the online training section on Bitrix.
Thank you!