Color theory is actually an all encompassing word that covers multiple fields of art. However there are three main categories to discuss.
The Color Wheel: In these posts I will go over the different color wheels, their history, as well as the definitions associated with them, and the connections with the other categories.
Color Harmony: What exactly is harmony? How to create harmonious art. What is a color scheme, some common schemes, and how to choose one for your art project.
Color Context: How color acts in relation to other colors, shapes, and objects in the real world. The relationship of values, saturations and the warmth of colors.