Providing good communication is key always make sure your employees understand what you are wanting them to do 

Make sure you are actively listening to the speaker and not talking 

When you need to give feedback do it as soon as possible so its fresh and nothing gets made up or wrong thing has been said. Some people dont like getting positive feedback but mangers should still give it. People can get upset when receiving feedback but sometimes its needed so maybe they will fix their problem.

Alway prepare for your meetings have an agenda, open discussion and opinions dont recap for late comers do it at the end if they are interested dont drag the meeting out and dont let them leave confused or stressed make sure everyone knows there rolls in what they are supposed to be doing.

I learned the hard way with my wife not to bring up old stuff from the past when giving feedback or having a discussion.

I've learned that nonverbal communicaiton is very important, from your facial expressions, the clothes you wear and even maintaining the simplicity of your pressentations is key to effective communication.