This 📝memo was, 📝By and Large, authored by 📝Sam Kaplan, co-creator of 📝One Gathering, and provides a general outline for being a respectful participant in a 📝Zoom meeting.

Joining the Room

When joining a Zoom room, it's hard to tell what you are walking into. It's best to try to not disrupt.

Test your audio and video prior to joining. Underneath "Join with Computer Audio" there is a button to test these things
Mute your microphone when joining. You may be joining an on-going conversation and you don't want to interrupt.
Turn your video on. Part of fully participating is being visually present in the room

In Room Etiquette

All standard social etiquette still applies, but there are some things that make Zoom unique.

Don't interrupt people - Zoom can only have one person talking at a time. The active speaker has a green box around their video. If multiple people try talking at the same time, nobody gets fully heard.
Keep yourself muted - This is especially important if you are somewhere that has ambient noise, it prevents interrupting others unintentionally. With the Push to Talk feature, you can stay muted and then hold the space bar to temporarily un-mute yourself.
Use the chat - Chat is a great way to say hi and bye to the group without having to interrupt or derail conversation. It's also great for sidebar conversations, sharing contact info, links, and anything else that might be a bit off topic for the current conversation.

Lighting - good lighting will make it easier for people to see you
Headphones - headphones can make it easier for you to hear others
Microphone - an external microphone can make it easier for you to be heard
Camera Angle - we tend to look better when the camera is directed slightly down on us rather than up from below us.
Set your frame - Don't cut off the top of your head, showing your space creates context