#5 - Quit Lying
It's at this point that many instructors do the worst thing they could ever possibly do. They make up an answer. Sure, it might be right. Then again, it might not.
Why would an instructor make up an answer when they don't know the real answer? Because their ego is getting in the way. As an instructor, many people think that you're supposed to be "all knowing." That could not be further from the truth.
If you do not know how to answer a student's question, do not B.S. After admitting this is a good question or comment, suggest that you will find out and let them know. Then do that. You don’t have to know everything. Your students will learn from what you do know. The rest, you can figure out together.
The next time you’re asked a question by a student that you don't know the answer to, admit it, and then help them find out the answer. Of course, in doing so, you will have taught yourself at least two things: the answer to the question, and that you don’t know everything!