Proximity—If two things are close together in proximity, we associate them with each other. Things farther away are considered separate.
Organization— Easy to understand, appropriate use of space (negative and positive), little ambiguity, but also taking into consideration aesthetics.
Hierarchy— Logical ordering of information- from most important to least important.
Example of bad practice: Employment Applications often ask you to fill out information in boxes with the instructions ("name" or "social security") either on top of the box or underneath it. I have been a victim of writing the information in the wrong boxes because of the ambiguity of the form. So frustrating. Here's an example: