These are some crucial core graphic design principles :

The Visual Hierarchy: This is allocating the visual weight to elements in a design based on their importance. The segregation can be done by fonts, size, and texture.

Color: Where the color can enhance the overall mood of the design and reflects the tone and sophistication.

Contrast: It is bringing together two or more elements that oppose each other in style, color, or look. That helps the viewer focus on key elements.

Proportion: That works together with dominance and priority and focuses on the scale of elements.