Attention, audio recording / production / live sound people!
DPA Microphones has been doing a series of excellent webinars you should check out.
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^ The third video listed is actually about how to create optimal audio for webinars.
Other topics include microphone hygiene, the impact of hand placement on live vocal mics, and mic placement options for better speech intelligibility.
Side note: If you are not familiar with DPA, they are one of the top manufacturers of professional microphones in the world. I own some of their products, and they are outstanding.