Having a clear visual hierarchy refers to how the essential elements in an interface appear about each other. This is the most important tool to make an interface feel well designed. When everything in your interface is competing for attention, it
feels sloppy, noisy, and chaotic. It makes it hard for people to understand what matters.

When you deliberately de-emphasize secondary and tertiary information and make an effort to highlight the most essential elements, the result is immediately more pleasing, even though the color scheme, font choice, and layout haven’t changed.