Design elements and principles describe fundamental ideas about the practice of visual designs.

Design elements:
The 3 F’s: Form follows function is known as the 3 f’s of Design. Form refers to what something looks like, and function refers to how it works.
Space: Area provided for a particular purpose.
Line: Continuous movement of a point along a surface.
Shape: An area that stands out from the space next to or around it due to a defined or implied boundary.
Texture: Perceived surface quality.
Form: Any 3-dimensional object.
Value: An element of art that refers to the relationship between light and dark on a surface or object. It gives objects depth and perception.

Principles of Design:
Unity
-Repetition
-Continuation
-Closure
Emphasis /Focal Point
-Contrast
-Isolation
-Placement
-Absence of focal point
Balance
-Symmetrical
-Asymmetrical
-Radial
-All over pattern
Proportion /Scale
Contrast
Movement
-Your eye is moved again and again through out the artwork.
Rhythm/Pattern
-And the polar opposite principles:
Variety
Harmony

Credit to Wikipedia