Proximity/ Alignment is about placing things related to each other to help lead the viewer's eye around the design. #CG2

Scale is about size. what Objects are bigger than the other and how do they relate to each other. #CG2

Hierarchy is the order of what elements are seen first and last. #CG2

Balance to some it up is just making sure all you visual, your objects, colors, textures make sure that they all compliment each other well.

Emphasis is what catches the viewer's eye in your piece.