It is said that photography pays attention to horizontal lines, which is really the case. I never understood. Can a friend with relevant knowledge send it to me for a look? urgent

The horizontal line is related to the proportion of the scene in the picture. It is customary to put the theme in at least two-thirds of the picture, such as the sky and the earth. In order to show the scenery of the ground, the sky appears at most 1/3 in the picture at this time. On the other hand, if you want to represent clouds or scenery in the sky, the ground accounts for 1/3 of the picture at most.

If the two scenes become 1/2, this composition is basically a failure, but it is not the same. It depends on how the photographer wants to express his intention.