Place objects where shown by the arrows & your composition will generally be pleasing. They are considered to be the four ideal positions for placing centers of interest.
The center of interest in this composition (the bird) was placed in accordance with the Rule of Thirds. The young man's face is placed in counterpoint at an opposing intersection, providing a visually-pleasing balance to the image.
Placing the horizon a third of the way down (or up) generally looks better than across the middle of the frame. San Francisco Bay
Here's a case where you have excellent subject control. You can have the model pose anywhere along the walkway. The rule of thirds indicates this placement which also gives the model a definite path to follow within the picture area.
To use this control, the photographer must understand how different shapes, lines, colors and their inter-action will affect the viewer, and then he or she will be able to incorporate them into images that meaningfully convey what he or she wants the image to state.