The Law of Proximity states that humans perceive objects that are closer together as related objects. And vice versa, objects that are farther apart are perceived as different groups.
In typographic design, “proximity” refers to the amount of whitespace created by line height, margin, and padding. There should be a distinctive and noticeable amount of additional whitespace between two different sections. Consider the following example:
Tactically, Headers should not have even top and bottom margin. They should hug their child paragraph and distance themselves from the previous paragraph.