I loved this presentation by sound expert (who knew there was such a thing?), Julian Treasure. It’s entertaining and practical.
Even if you don’t plan to give a public talk in the near future, this information applies to every day communication skills.
I could summarize the sins, but they’re much more effective coming from Treasure.
I haven’t read his book “Sound Business“, but I probably should since I think I suffer from a curmudgeonly sound-sensitivity as I get older. Sort of the opposite of hearing loss. The presentation was so useful that I’m guessing the book has some suggestions on how to optimize environments through sound (or no sound-which is what I would prefer).