Composition

It is a proportion of the image’s width and height.

Balance refers to an even distribution of visual weight (satisfying arrangement or proportion of design elements)

It is a term of responsive web design, that refers to some anchor resolutions, where design and content adapt to perform better user experience. 

Columns are vertical elements of the grid.

The golden ratio is a specific relationship of 1:1.618 between various size elements.

Grid lets arrange massive of various content into the nice-looking dynamic system, adaptive to display at any device.

Gutter divides columns and rows, making the content readable.

They are vertical lines, used outside the layout grid to adjust components.

The layout can be named as a product of user interface design.

Margin is called the distance between the content borders of design components.

It is a space inside the component of the content.

Proximity stands for a rule of how we group objects and perceive them.

The term comes from print typography, and refers to vertical gaps between components of the layout.

Whitespace describes distance around the elements and between them, meaning margins as well as paddings.