If you are an MTNA member or teaching RCM comprehensive curriculum exams, their websites provide many beneficial webinars. There are also tons of other resources such as Zoom's live training that are free to teachers.
Tech 101 by Noreen Wenjen
Online teaching/communication by Stephen Pierce and Sara Ernst
Here are additional pedagogy websites:
Frances Clark Webinars: "Teaching in the time of Covid-19," need a subscription to access