The document discusses color theory, including: 1) The three primary colors - yellow, magenta, and blue - which cannot be made from any other colors and are equally spaced on the color wheel. 2) Secondary colors - orange, green, and purple - which are made by mixing two primary colors in equal amounts. 3) Tertiary colors - which are made by mixing a primary and secondary color. 4) The color wheel organizes all colors in a circle based on their relationships as primary, secondary, or tertiary colors.