In color theory, what are primary and secondary colors?

I went through an article on color connotations and it did not explain why colors are grouped as primary and secondary so I don’t know if it is important to know the reason why we have:

warm color
red -> orange -> yellow (red and yellow being primary colors)

cold colors
green -> blue -> purple (blue being primary color)

My questions:
a) Is there an important reason why these are the primary colors?
b) Is their a rule on how these groups (primary and secondary) colors should be used. for example would you ever say “for this element you need a primary color)
c) Would you use cold and warm colors together in a website
d) how important is to know how (for example) information like blue + yellow = green

Also (might seem slightly of topic) I started experimenting with the color while and I don’t get where would you chose the mono, complement, triad and so on. Can anyone direct me to a blog post which explains the reason why there are so many options to chose from; or the “good way” to use the color while

Thanks a lot

Answer

In a nutshell, primaries are colors that are themselves. The secondary colors are constructed by mixing two primary colors.

Complementary colors are typically on opposite sides of a color wheel and are the ones, when mixed together, create gray. In the real world of color, few pigments are pure, so you usually get a brown.

When you mix all primary pigments, you get black. (With light, you get white.) Again, in the world of pigments you don’t actually.

Any book that talks about meanings of color are selling you paper.

Attribution
Source : Link , Question Author : aurel , Answer Author : Mateen Ulhaq

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