Here's a wonderful brief post on Etiquette and communication. A neat summary of some essential rules..
https://www.huffingtonpost.com/entry/5-timeless-rules-of-etiquette-to-live-by_us_5a81b99ee4b0c6726e15bff4
https://www.huffingtonpost.com/entry/5-timeless-rules-of-etiquette-to-live-by_us_5a81b99ee4b0c6726e15bff4