Microsoft Teams
Microsoft Teams is a virtual conferencing tool that integrates chat, audio and video conferencing. It also brings together multiple cloud programs. Below are several training documents on how to use Microsoft Teams.
https://support.microsoft.com/en-us/office/microsoft-teams-video-training-4f108e54-240b-4351-8084-b1089f0d21d7
https://docs.microsoft.com/en-us/microsoftteams/instructor-led-training-teams-landing-page