The rule of thirds is an important feature of composition in visual arts, such as photography, painting, and graphic design.
The rule suggests that you should divide your frame (or canvas) into nine equal squares using two horizontal and two vertical lines. These lines intersect at four points, which are considered to be strong points of interest for placing your subject matter.
The "important" portion of text or an image should be placed along these intersection points or along the lines themselves. This creates a more balanced and visually pleasing composition, drawing the viewer's eye naturally to the key elements.