First lesson: When a law enforcement officer shows up at your door in response to a call, remove any attitude chip from your shoulder.
Second lesson: When asked to produce identification by said officer, comply promptly, calmly, and without complaint.
Third lesson: Keep in mind that police risk their lives minute-to-minute to protect our individual safety, and behave with appropriate respect.
Fourth lesson: If you end up arrested because you never learned the first three lessons, accept personal responsibility and don't misplace the blame on the police officer.
Fifth lesson: A president who announces in a televised press conference that a police officer "acted stupidly," is acting stupidly.