Before hosting a meeting or virtual classroom it is strongly encouraged you read, Reducing the Likelihood of Zoombombing from Minnesota State, which includes a step-by-step outline of setting options to help you keep Zoom meetings and virtual classrooms secure.
This document covers:
In addition to the Minnesota State Reducing the Likelihood of Zoombombing, you may find it helpful to watch some video about securing Zoom: https://www.youtube.com/results?search_query=zoom+securing+meeting.