Color is an infinitely complex topic. Martian color wheel is the best color wheel I've come across as it includes tints and shades. It's a great tool to understand color relationships.

Color wheels help giving names to specific colors. If you can name more colors, you can think about the closely related variants.

Color wheels help creating palettes. You pick colors with enough contras, you can select complementary color, etc.

Souces

• Martian Color Wheel