If you have not watched my first video: "Colour Theory: Hue and Saturation" I recommend you do before watching this unless of course you are very familiar with the conventional colour (color) wheel.
This video reveals the true colour wheel for artists and designers. that can be understood by looking at additive and subtractive color systems.
At the end of the video you can see the colour wheel up close. Note that this colour wheel is correct for additive colour and subtractive colour, it's just labeled differently for primaries and secondaries.