Girl Playing Golf

The rules of golf are internationally standardised and are jointly governed by The R&A, spun off in 2004 from The Royal and Ancient Golf Club of St Andrews (founded 1754), and the United States Golf Association (USGA).
The underlying principle of the rules is fairness. As stated on the back cover of the official rule book:
Play the ball as it lies, play the course as you find it, and if you cannot do either, do what is fair.
There are strict regulations regarding the amateur status of golfers. Essentially, anybody who has ever received payment or compensation for giving instruction, or played golf for money, is not considered an amateur and may not participate in competitions limited solely to amateurs. However, amateur golfers may receive expenses which comply with strict guidelines and they may accept non-cash prizes within the limits established by the Rules of Amateur Status.