CST have 3 basic colours: Green-blue, Sand and Orange.
The 3 basic colours can also be used in a more dark or light version. In general the 3 basic colours are used on a white background colour in all contexts.
The RGB (red, Green, Blue) and HEX are colour declarations to describe the colours used on a screen.
CMYK (Cyan-Magenta-Yellow Key) is used to describe the colours of the 4 basic colours in a 4-colour print
Pantone is an international colour system that is used to describe the foil colours, textile printing, etc.