column-count 
column-count: 2;

Values:
unit 
auto // determined by column-width

Breaks content into a number of columns.

Columns CSS
column-width 
column-width: 5rem;

columns: column-count column-width; //shorthand

Specifies a suggested width for columns.

Columns CSS
column-gap 
column-gap: 2rem;

To define the space between columns.

Columns CSS
column-span 
column-span: all;

Specifies how many columns an element should span over.

Columns CSS
column-rule 
column-rule: style color width;

To set borders between columns.

Columns CSS
break-inside 
break-inside: avoid-column;
Values:
auto
avoid
avoid-page
avoid-column
avoid-region

Sets how page, column, or region breaks should behave inside a generated box. Example shown in video at 2:50.

Columns CSS