A golden rule is a principle you should remember because it will help you to be successful.
Hanson's golden rule is to add value to whatever business he buys.
golden rule in British English
noun
1.
any of a number of rules of fair conduct, such as Whatsoever ye would that men should do to you, do ye even so to them (Matthew 7:12) or thou shalt love thy neighbour as thyself (Leviticus 19:28)
2.
any important principle
a golden rule of sailing is to wear a life jacket
3. another name for rule of three
golden rule in American English
the precept that one should behave toward others as one would want others to behave toward oneself: see Matt. 7:12; Luke 6:31
Examples of 'golden rule' in a sentence
golden rule
He has broken the golden rule of the mountain.
Times, Sunday Times (2010)
I had just broken the golden rule of superstitious bookmakers.
The Sun (2008)
But when he breaks his golden rule to never fall in love with a client, things get complicated!