When you completely miss the ball, just hit air.
A stroke in its' simplest terms is an attempt to hit the golf ball, this includes air shots, if you swing and miss, that is one stroke also.
A putter in golf allows you to hit a ball in close proximity to the hole. If you were to use, say a wedge you would completely overshoot it and miss completely.
Some things that you would hate to hit while playing golf include:TreePersonSand trapWaterCrocodile
You get a free drop, no penalty
"Hit" is another name for it.
Only if it was going to hit or come close to hitting another group of players.
When you hit the flag in golf its called a pinshot.
a golf club
you hit it with a golf club on the ground or on a peg