(Written mostly for myself)
I use DroidCam - which converts your Android into a wired or wireless webcam.
Set the resolution
Add the following text:
options v4l2loopback_dc width=1280 height=720
Most video call services are limited to 720p, and streaming 1080p and higher via USB isn't always possible.
Interact with the Android
My Android's screen faces away from me - so I can't easily touch or interact with it. Here are two useful utilities:
Check the battery level of the device
adb shell dumpsys battery | grep level
Manipulate the phone from your laptop
scrcpy - that mirrors my Android screen onto my desktop and I can interact with it using keyboard and mouse. Handy for restarting the DroidCam app, or fiddling with various settings.
If you're daft enough to go down this route - what tips do you have?