Ask HN: Advice for Teaching Music Remote?

Hey gang, My brother teaches classical guitar privately in a UK city. Things are normal right now. But my brother has been hospitalised with pneumonia the last two flu seasons, so he would be quite vulnerable if coronovirus spread here. He's self-employed and doesn't have insurance for this, if he stops teaching he stops getting paid. I want to help him prepare to teach guitar remotely, but this isn't an area I have any experience with. He has some student exams coming up and they usually want intensive tutoring during this time. Do any of you have advice for transitioning to remote music teaching?