I have used zoom for teaching for the past 2 years. @ Kalina, I am not sure if you still have that question about zoom and break out rooms. I would suggest to create several session of say 30 each at staggered times. Then assign your TA’s to each of these sessions. There is a feature in the break out rooms that allows students to ask for help to the host. Please let me know if you would like for me to elaborate.