Is the subject of photography and the center of interest the same thing? If not, what does it matter?

The center of interest refers to the position that observers can easily notice. Experience uses the "nine squares" rule, that is, the horizontal and vertical directions of a rectangular chess piece are divided into three parts, and the imaginary intersection of four lines is often the center of interest, which is also a place that people can easily notice. The center of interest is often not the center of the film.

The subject is the subject ... this is easy to understand.

The relationship between the two is that if the subject is in the center of interest, it can best set off the subject. This is the place to pay attention to when composing music.