What do those files of the SLR camera mean?

The main and most commonly used gears of SLR cameras are as follows:

1, full manual shift (M shift): all shooting parameters of the camera can be adjusted manually;

2. Shutter priority (TV file, Nikon is S file): all parameters can be adjusted except aperture;

3. Aperture priority (first gear): all parameters can be adjusted except shutter;

4. Automatic program (P file): except aperture and shutter, other parameters can be adjusted;

5.AUTO: basically all parameters are automatically adjusted by the camera, that is, "Fool mode, which is not recommended for general SLR shooting";

6. There are also some sports modes, macro mode, no flash mode, etc. Different brands may or may not have them, and they are rarely used.