Frequently Asked Question
Zoom offers a lot of customization for audio sources. Input and Output are both controlled by the chevron next to the Mic/Mute Icon in the bottom left. In my photo below I have both a HDMI output (like a projector or TV) as well as a bluetooth option (could be a soundbar or headset). Microphones can also be changed as often as you like here (bluetooth headsets are great for zoom!). Any new audio device takes about 5 seconds to appear in this list for input or output.
If you are hosting a zoom and want your audience to hear your computer's sound (a game or video for example) then 'Share sound' must be selected as below: