Gestalt theory describes how people tend to organize visual elements into unified groups based on principles of similarity, continuation, closure, proximity, and figure/ground relationships. The grid theory includes the rule of thirds and 960 grid system for positioning focal points. The golden ratio uses a 1:1.618 proportion based on the Fibonacci sequence to create a harmonious composition. Color theory utilizes the color wheel to understand relationships between hues and create visual balance. These design theories provide strategies for effectively arranging and relating elements to attract viewer attention and guide their experience.