How many meters is the close distance in photography?

Encyclopedia's explanation of close-range photography is that close-range photography is called close-up or close-up, which is even closer than the shortest shooting distance of the lens (usually 8 times the focal length). Also known as close-up, close-up, close-up and close-up. Close-ups are called close-ups. Close-range photography can be divided into equal-magnification photography and low-magnification photography according to the size of the object.

What I want to say is that photography has no formula, reasonable exposure, beautiful composition and good color matching, so that good photos can be taken.