Primary colors are unique because they cannot be mixed from any other colors. They are red, yellow, and blue.
Secondary colors are made by mixing two primary colors.
Tertiary colors are made by mixing the primary and secondary colors nearest each other.
Colors that are directly across each other from each other are called complementary. As opposites, one will be in the cool family and one will be in the warm family.
Analogous colors are colors that sit next to each other on the color wheel.