Golf Rules Out Of Bounds. All areas outside the boundary edge are out of bounds and not part of the course. White Is the Color of Out of Bounds.

Ball Not Found Within Five Minutes a. 2019-10-28 A players ball lies in bounds but against a boundary fence. Refer to Rule 27-1 for more information.
What this means is that you incur a one-stroke penalty and need to go back to the point from where you hit your last shot.
You hit your tee shot out of bounds. Provisional Ball Rule. Out of bounds is defined by the line between the course-side points at ground level of white stakes and fence posts. What this means is that you incur a one-stroke penalty and need to go back to the point from where you hit your last shot.