Conversations are the basis of relationships, and relationships are built on trust. You will find that the more open you are about the limitations of your knowledge, the more weight people will give to your opinion when you offer it. If you don’t know something, just say “I don’t know.” Those three words can strengthen the bond between you and another person. And just as important, they are a gateway to further exploration and growth. You can’t learn unless you admit that you have something to learn.