What is the meaning of "points and lines" in photography? Among them: one point, two points, multiple points; what are one line, two lines, and multiple lines?

Good question. In fact, points and lines are the focus of vision. Not all points and all lines can be called "points" and "lines" in photography. Only those things that look distinctive, attract attention, and can be used as composition elements can be abstracted.

So the points and lines in photography are concrete and vivid. It's not black and white lines. It's a feeling.

For example, the horizon is a compositional element. However, you can't see it on the screen, but it is there.

Many photography tutorials define points and lines incorrectly. Feel it yourself, feel it is a point, and it is a point. If it's not a line, it's not. The only thing that guides the line of sight is the line.