I am slightly biased because of my experience, but I think this infographic from Micah Bowers does a great job to help non-designers improve their decision making when working with colour.
Thankfully, mastery of color in UI and UX design isn’t dependent on guesswork, blind luck, or some intrinsic realization of what colors work well together. Instead, using color successfully depends on understanding repeatable rules, principles, and techniques that can be practiced and improved upon.Micah Blowers, Toptal
And while it’s true that the study of color is an immense undertaking, there are practical takeaways that can drastically improve a designer’s understanding and use of color in day to day design work.
Infographic by Toptal