0. Always remember the source of the rule.
All through my life, especially my career, I have run into rules that make no sense. Once I was given a 'beat down' by the IT department of a former employer for not following a specific rule. When I asked how I was to have known about the rule, they said it wasn't documented or published. I then asked if there is a list of other undocumented/secret rules I should know about. They didn't laugh. Too many times a rule or guideline is drawn up and rolled out to the masses. Then time goes on, and if things are going well, the business changes. [Side note: If your company doesn't change, then get a new job, because that company won't be around for long.] After the change, the rule is still blindly followed, doesn't make any sense, and people are still following it. Also, after this business change, the rule might need to be updated or removed entirely. If you don't remember the reason for the rule, then you won't know when it needs to be updated. This fo...