Join a Zoom Class:
You can join a meeting by clicking the meeting link or going to join.zoom.us and entering the meeting ID. Your link and/or meeting ID should be provided to you by your instructor. Zoom will prompt a download upon joining your first Zoom meeting.
Webcam and Mic:
While you are not required to have a webcam or mic to join a Zoom meeting, you will not be able to transmit video or audio. You will continue to be able to listen and chat during the meeting, share you screen, and view the webcam video of other participants. A webcam and mic are encouraged!
Read more info here: Getting Started