-How do I hit the ball?
Stand on top of it, not adjacent to it.

-How do I save?
Interact with the flag on the green of a course, and it'll give the option to save.

-There's only one course?
Yes. If people want more, by all means let me know if that's of interest to you.

Questions/comments with all the same answer:
-I can walk through water
-I can move to any height
-I can walk through trees
-The ball can be on the same space as a tree
-Some divots are invisible until you're in them
-Some terrain has weird edges
-Some terrain make weird sounds when you step through them
-Some clubs make weird sounds when you use them
-There's a really long/short pause when using a particular club
-My character turns so I can't see where the ball goes

These are entirely intentional. If you encounter something else, please let me know. It may or may not be intentional and get added to this list.