1. The Rule Of Thirds
The rule of thirds is a concept in photography and videography in which the frame is divided into into nine imaginary sections(as shown above).The theory is that if you place points of interest in the intersections or along the lines then your photo becomes visually more appealing.
2. Leading Lines
Leading lines refers to a composition technique where the viewer's eye is attracted to geometrical lines that leads directly to the main subject of the photo.
3. Symmetry
"Symmetry" refers to a line that splits the object in half and, if both sides of the object are an exact mirror image of each other, then this object is said to be symmetrical. If you want to create a pleasing and calming composition, you have to achieve balance in the photograph.
Note: These Rules can be broken when you have a motive to do so.