Smashing magazine - (Color Theory)
Color com - (why-color-matters)
Toptal - (A Color Crash Course)
Interaction Design (Color theory)
London Image Institute - (color-psychology)
Color Contrast & Accessibility
Material Design - (Color usage and palettes
UX Collective - (60-30-10 rule)
https://www.palette.eco (paint collection)
Brand Colors - (collection of official brands
https://www.designspiration.com/palette/4b1833-842959-592f2b/