Anyone got a online platform they reccomend? For either Live or canned content?

I am a freelance writer and also help others with some website setup, nothing too "code-heavy" but I can figure out different softwares for different needs...

Anyway, I want to offer some class content of my own. I have a small text and workbook, that I can add to the offering. I was thinking of setting up my phone and a whiteboard and just doing the class like that. Or I could offer in real-time and have people ask questions.

I have no idea where to start looking for this stuff.

Anybody got a few keywords or places to look?