Unless your appearance or background is very inappropriate or distracting, turn ON your video. Always do a mic test and playback in Zoom before you join a meeting to make sure others will be able to hear you.      

How do i test zoom before a meeting – none:.How To Use Zoom: A Step-by-Step Guide

  Instead, notes are useful for organizing your questions and feedback. Otherwise, you will be backlit. Zoom audio problems can appear in several ways. Do not disable any necessary devices that help protect or otherwise secure your network. Subscribe on YouTube! Meeting with your colleagues using an app like Zoom is the new normal, but most people are still only getting used to it.