Having grown up in the printing industry prior to my experience as a photographer, it's safe to say I'm pretty well-versed in colors and their usage. For any kind of visual artist, knowledge of color is an absolute must, even if you're just a black and white sketch artist, you've got color in mind when you shade your gray tones. There is lots of info out there about color, and there are lots of different categories. For instance, you've got primary colors, secondary colors, tertiary colors complementary colors, analogous colors, neutral colors, warm colors, cool colors, calming colors, exciting colors, and tints and shades of all of them to hit everything in between. That's a LOT of color!