P mode, SCN scene mode and AUTO automatic mode in SLR cameras. What's the difference between these three modes? Feelings are automatic.

P mode belongs to program mode, and the camera will give you appropriate aperture and shutter according to metering, while ISO, exposure compensation and metering mode need to be set by yourself. You don't need to set the automatic mode at all. All the settings are the same as those of a fool's camera, and the camera will help you complete it. The scene mode is a bit like a mixture of these two modes. He preset some data in the camera. For example, in sports mode, he will set the shutter on the fast shutter, while in landscape mode, the contrast will be improved. These modes are suitable for beginners or emergencies.