Brandeis National Committee - San Fernando Valley Chapter

Zoom has been free for small (under 100) groups for meetings of 40 minutes or less, or for 2 people without the time limit. For larger groups, contact the president, Lea Templer, to use the Brandeis account.

Official Zoom help documentation: Main page: https://support.zoom.us/hc/en-us/articles/360042443452
This should have what you need, and is updated as needed by the Zoom creators.   Includes:
-- The Quick Start Guide
-- Audio, Video, and Sharing
-- Also: Meetings & Webinars; Zoom Phone; Account & Admin; Zoom Rooms, Messaging, and more

To use your smart phone as a webcam (and mic): This from PC magazine: https://www.pcmag.com/how-to/how-to-turn-your-smartphone-into-a-wireless-webcam Useful if your device doesn’t have a camera.