What Do You Need to Know About Virtual Presentations?

For those that are brand new to the world of virtual presentations, what do they need to get right out of the gate? A lot of people know pieces of it, but then there're other pieces of it that i don'tinteracted with people about this. It's my feeling that a lot of them have never even thought about some of these issues. I mean, for example, one of the ones i like to talk about is not to sit in front of a bright window because then your face is in shadow and people can't see you.