Colour is central to our lives. As artists we have active control of colour to communicate with our viewers. There are observable ways colours interact to express our tastes and feelings. As we create we explore the feelings, the stories the colour helps us to tell. We can purposely go against our taste, in order to provoke or flow with it in order to placate or the third option is to downplay colour by going black and white. Knowing how they play together gives you freedom of choice.
Light is ultimately what visual artists are playing with.
Here is an interest well done video explaining visual composition. It’s good for artist but it is also good for audiences, viewers, everyone because it can help you appreciate any visual experience.