Balance is the visual weight of elements in a composition. Balance is used to add stability, add structure, create emphasis and to create dynamics.
Contrast is used to create an obvious difference between the objects of your design and highlight them as a result.
Emphasis highlights the most important element and makes your audience concentrate on the focal point of your design.
Proportion is the relative size of the design elements compared to each other. It comes organically once you’re done with your contrast and balance.
The recurrence of an element, color, shape, or form in design is called repetition. It unifies your design elements and gives them a kind of a signature look.
Movement helps you make the most important part of your design the beginning of your composition.
White spaces are used to separate elements and to help us identify the visiting areas
Variety is the use of several elements of design to hold the viewer's attention and to guide the viewer's eye through and around the work of art.
Last, but definitely not least principle, visual unity refers to the harmony between all parts of your design.