How do you create a two-column layout without using float or position, using only display?

Use flex for simple, responsive side-by-side columns that adjust naturally to container width.

Use grid for more complex layouts requiring explicit column widths, multiple rows, or advanced alignment.

Add gap to control spacing between columns instead of using margins on child elements.

Avoid mixing floats or absolute positioning when using flex or grid; rely solely on display properties for clean layouts.