Unity - In design, proximity or closeness creates a bond between
elements on a page. How close together or far apart elements are placed
suggests a relationship (or lack of) between elements on the page.
Repetition / Consistency - Repeating design elements and
consistent use of type and graphics styles within a document shows a reader
where to go and helps them navigate your designs and layouts safely.
White Space - Designs that try to cram too much text and
graphics onto the page are uncomfortable and may be impossible to read.
White space gives your design breathing room.