In short: Using this interactive tool by following James Gurney's teachings can help you find harmonious colors on the color wheel. Picking a color palette can be daunting and if you just started painting, even frustrating. That is because there is a lot of science behind it and light that needs to be understood in order to master its use. There is many resources out there that do a wonderful job covering this topic. Gurney's book is one I will make sure to list more for you in the near future.