The colour
Colours are divided into three types
Primary colours
Neutral colours
Secondary colours
Primary colours are:
Red
Blue
Yellow
Neutral colours are:
Black and white
The secondary colours are the colours that result from mixing primary or neutral colours.
Now you have to learn this it is very important:
Yellow + blue = green
Yellow+ red=orange
Blue +red=purple
Yellow +blue +red=brown
You can learn it better if you apply it yourself and discover yourself.