I don't have any model/theory in particular. But what we are doing at the moment are exploring Microsoft 365 education & GSuite. They are online platforms for virtual classrooms. You can go for online as well as remote T&L

Besides that, you might want to explore the use of video apps such as Zoom, MTeam (a part of ms 365 education), webex etc (just to name a few)...

@Suhaily Abudllah thank you for your comment

I recommend the Transactional Distance Otto Peter's Theory https://www.amazon.com/Otto-Peters-Distance-Education-Industrialization/dp/0415867290

Thank you very much

Alex Sandro Gomes Suhaily Abdullah thank you very much for your comments

Kindly check the below link:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://files.eric.ed.gov/fulltext/EJ1154117.pdf&ved=2ahUKEwjb-dLS0OfpAhWnILcAHfQECZgQFjAAegQIAhAB&usg=AOvVaw2z1MGQi8HUYLIqUzVP10Lj

@gulbir Singh thank you a lot

Thank you for all your efforts. I am trying to get a model or theory about online teaching/ vitural classroom to build my questionnaire upon. Anetta Kepczynska-Walczak Gulbir Singh

I think that whether or not the class is online, student-centered active learning grounded in cognitive psychology and constructivism should always be the starting place for instructional design.

Separate from that, here is a model for curriculum design that incorporates technology, up to and includes 100% online classes. It is focused on language learning because that was the subject of the book, but the same processes would be true in any field,

Chapter Creating a technology-rich English language learning environment

Hello. Methods used in distance education: discussion, case study, problem solving, demonstration, project-based learning, self-study and collaborative learning. Especially if the courses are practical, project-based learning and self-study are more appropriate.

I think there is no specific theory or theory ideal, but it is important for the teaching to be student-centered.

So I agree with Dr. Michael W. Marek In this part, because teaching centered around the student is the only way to achieve all of the learning satisfactorily for the teacher and student.

So please read this article because it is at the heart of online education:

Article A Theoretical Framework for Effective Online Learning

Keep students involved from the beginning of class by telling them that you will be asked about X and you about Z..... and so forth. Doing so will keep them concentrated.

I think it's worth taking a look at: https://www.youtube.com/watch?v=WrjL5Lfw1mU

You could look at Garrison, Anderson and Archer’s online community of inquiry model.