How to classify exposure modes? What does full manual mode mean?

Including shutter priority, aperture priority, manual exposure, AE lock and other modes.

Manual exposure mode requires manual adjustment of aperture and shutter speed every time shooting, which is beneficial for photographers to create different picture effects. If you need a picture of the moving track, you can extend the exposure time, speed up the shutter speed and increase the exposure (many friends find that the subject is often blurred when shooting moving objects, mostly because the shutter speed is not fast enough. If the shutter is too slow, the result is not a trajectory, but a blur); If you need to create a dim effect, you should speed up the shutter and reduce the exposure. Although this kind of autonomy is high, it is inconvenient and does not allow time to capture fleeting scenes.