The green.
You are putting.
mini golf is basically putting practice with obstacles
That's called the green.
Mini Golf was invented as a tourist atraction for a southernour's hotel.
Green is a noun here, meaning a part of the golf course (putting area). The word golf is an abstract noun for a game - it is a process with rules, that cannot be seen or touched, even though the golfers and golf clubs, and fairways are all concrete nouns.
Angel Park Golf Course.
Hole out is simply finishing a hole of golf, obviously by putting the ball in the hole.
Putting
Putting
By practicing on the driving range or putting green of a golf course.
Golf