As I am cleaning out my model, room I came across some reaper color sets . Some i even forgot I had but anyway . I would like to learn how to do this on my own not that reaper paint is bad but would like to have less paint and more color knowledge can anyone explain this to me using acylic and or oil paint ?

This will explain it a bit better than I ever could:

http://color-wheel-artist.com/triad-colors.html

Thank you much for the link . Great info .

The link Billy provided discusses the color theory behind "triads", which is excellent info.
On a more practical basis, however (and I'm probably being "Captain Obvious" here), the model paint manufacturers know that many of us do NOT have a color theory background - we just want to paint our miniatures. So they have put together groupings of similar colors together, in "triads", so we have a base color, a shadow, and a highlight, all without having to mix them ourselves. If used straight from the bottle, rudimentary shading can be accomplished. With a little mixing, five shades can be made, thus making the blends "better". Add a darker color (let's say black), and the deeper shadow is possible; same foe adding white to the lightest shade. Use the complimentary colors from the color wheel, and all sorts of variations can be developed. As a marketing approach, it is a good move on the part of the paint manufacturers. For those new to painting, the combinations can be a godsend. Experienced painters, or those of us who's paint collections rival our grey armies (raise you/our hands!), likely have many/most of the applicable shades, but the groupings into 3s (or 6s for the Andrea or Scale75 color sets) still make a lot of sense. Hope this helps.

Yes helps alot thanks for the reply . I read somewhere how to get the triads of vallejo but can't find it now. If I do I will let you know it would simplify things.