1. Monochromatic Colors
   1. One Base Color/Hue
   2. Different Shade/Tone/Tint
2. Complementary Colors
   1. 2 Opposite Color on the Wheel
   2. Contrast
3. Split Complementary Colors
   1. Split One into 2
   2. Contrast with Variety
4. Triadic Colors
   1. 3 Colors Spaced a Trangle
   2. Bold and Vibrant
5. Tetradic Colors
   1. 4 Colors
      1. Rectangle Shape
      2. 2 Sets of Complementary Colors
   2. Focus on Main Color
   3. Contrast with Others
6. Analogous Colors
   1. 2-4 Colors Next to Each Other
   2. Simple and Appealing
7. https://www.xmind.net/blog/en/color-harmony-tricks-for-mind-mapping-you-need-to-know/