Hierarchy design principle
Hierarchy is used to guide users through a design, making content stand out in the order of importance. Achieving visual hierarchy can be done through scale, color, spacing, and placement of elements, and signals to users which part of a layout they should pay attention to first.
Hierarchy can be achieved through a number of other design principles, including movement and contrast.
Pro Tip: Use contrast and emphasis mindfully — if everything is calling for attention, then nothing will stand out.