It's not my job, but I study law and there are so many little things that come in handy. The Norwegian law system is a bit different from other countries' so I won't get into detail, but as an example I just feel so much secure now when purchasing stuff; online and in stores, because I know more specifically what I can demand and not.
Edit: Secrets
Well I guess the law is kinda a secret because most people don't even bother