There are many ways to improve your color perception. To some people color theory comes easy, but more often than not, these people are already fairly expressive in their art. They have a stylized or very artistic approach to art in which color is just a way to emphasize their goal. For artists that lean a bit more toward realistic art, color theory is a bit harder because color shifts in our world are way more subtle. but they are there!
Art fundamentals of color theory is a treasure of knowledge that will make your artwork pop. But it can also be a pain in the butt. Color theory is among the hardest to grasp fundamentals of all of them. Even when you know the rules, it might be hard to apply them. This doesn’t count for everyone though. Color theory to some people comes naturally, which might make it even more frustrating to those that have trouble mastering it.