"I tell people, Don't take my advice. What do I know?"

This quote by Nick Lachey is a funny way of expressing humility. He is suggesting that he is not a professional in any specific field which his guidance should not be taken too seriously. He is also implying that he is not foolproof and that his advice might not always be the best. This quote is a suggestion that everybody has various viewpoints and experiences, and that it is important to think about all point of views before making a decision. It is also a tip that it is very important to be available to learning from others and to not be too quick to dismiss guidance. Ultimately, this quote is a suggestion to be humble and to not take oneself too seriously.