In photography, how to construct cool and warm colors based on visual psychology?

What is the color scale? What are the three elements of color?

What is the additive color effect and what is the subtractive color effect?

What is the spectrum of colors and what are the three primary colors?

How to understand the histogram of a digital camera?

What is white balance? What are the common white balance settings?

What is the tone level? How to control the tone of photography?

What is the tone of photography?What are its classifications?

What is exposure? What are the classifications of photographic exposure? How to achieve accurate exposure?