What is the stability of the shooting effect in photography, and what is the significance of the trichotomy?

Stability means that the composition should not be tilted, that is, it should be stable.

Blank is blank ... leave some blank, of course, not necessarily white, leave some clean or agreed space.

Trigonometry is composition. There are four lines in the viewfinder of a digital camera, which divide the picture into three parts.

The combination of reality and reality means that there is reality in your picture and reality in the subject, as long as there is a big aperture.

The last one doesn't understand what it means. ...