A golfer's assistant is called a caddy. A caddy is paid by golfer. Most professional golfers have caddies.
A 'scratch golfer' is the name given to a golfer whose handicap is zero.
Duffer
duffer
A bully expert is called a bullnation
what ia an expert pilot called
An Expert Aviator is called an "Ace".
A cultures expert is called an ethnologist.
Caddy.
Caddy these guys only really help professional golfers that are on the tour
Don't know the origin of the word, but a snake expert is called a herpetologist.
An expert on China is often referred to as a Sinologist or a China specialist.