Rule of thirds is drawing two horizontal lines and two vertical lines. This way you will get 4 intersectional points. Placing your subject on these four intersectional points (any one of them) gives you a better composition.
This sunrise photograph is one of the best example for rule of thirds. The subject is placed on the lower right intersectional point. Imagine, the sun was somewhere in the middle of the frame or any other place other than the 4 intersectional points. The image would not have been this good.
There is a simple dead tree in the middle of the lake and three cormorants sitting on the branches. This becomes the subject in this photograph. The top left intersectional point is used as the point of attention. It is obvious that the point of intersection is not exactly maintained. The subject can be anywhere near the intersectional points.
This photograph is another good example for Rule of thirds. The bottom left intersectional point is maintained as the point of attention/interest.
In this photograph, the bottom right intersectional point is tried to maintain as the point of interest. There is no other important subject maintain elsewhere in the image.
Rule of thirds can be used in portrait orientation as well. In this photograph, both the eyes of the kid is perfectly maintained on the top two intersectional point.
I hope you have a better understanding of how the Rule of thirds works. It generally gives a minimum guarantee for your photograph.
In composing a photograph, the Rule of thirds is one of the basic rules to start with. Try this rule in your photographs, let us know how it helps you.
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