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>How does the rule about not talking to police work? What about when police are canvassing the neighborhood and they are knocking on every door? Are you supposed to talk then? What about when you have info of a crime? What about when you want to report a crime?

The important bit is "if the police are asking questions with any level of suspicion at all". Every person has to do their own personal risk assessment, and maybe you don't always know whether you're under suspicion, but if the police want to talk to you and you have any reason whatsoever to think that you're under suspicion, you're rolling the dice by agreeing to talk to them without a lawyer.