Color is huge! There are so many half-baked trends in color that look great for people on large screens with wide color gamut and young eyes, that in less than ideal conditions are completely illegible.

Some of the best guidance for the use of color written in plain, easy to understand language: https://designsystem.digital.gov/design-tokens/color/overvie...

Should be mandatory reading for anyone with any hand in designing a user interface.