Bob, if you posted that the sun rises in the East and sets in the west as a general rule, somebody here would dispute you. Its a little north or south of East and West. Probably go into Earth inclination, rotation, on and on. You are a good teacher and try to help folks (like me) understand photography. A fine photographer, too. Appreciate you.
rmalarz wrote:
"Is depth of field equally distributed in front and back of my focus point?
No, it’s usually about one third in front and two thirds behind your focal point, but as your focal length increases, it becomes more equal".- https://digital-photography-school.com/understanding-depth-field-beginners/
Again, for the average beginner, which this post seemingly is by, the 1/3-2/3 is good enough. I didn't wish to extend that to a detailed treatise on optics.
--Bob