USB mics are going to be needed more and more for online lessons. If you are a music teacher, you need to get one. As USB microphone is a microphone that simply pugs directly into your computer using a USB connection. This is what USB drive looks like:
This is what USB cables looks like:
I use a USB Mic called a Snowball ICE. Here is a link:
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I use this microphone for conference calls, for my online lessons and for my kids's online music lessons. They play violin and cello. You can find these microphones for $50 and for $50, you improve the audio quality drastically on a Zoom call. There are of course more expensive USB microphone options.
If you need help in thinking about which USB microphone to get, send a DM. I would be happy to help.