Proximity/groupings and visual hierarchy:
Balance: the design and proportion of the object.
Alignment: arrangements in the correct/appropriate position.
Harmony/proportion: the size of the object and how it adds and looks together.
White space: The negative space in which there is blankness.
Repetition: repeating of any object/words
Color and the color wheel: a circle (usually) in where you could pick different colors.
Rule of thirds: guideline in which an image is divided equally in nine parts to help with the proportion and aligning.