How can we position elements by grid area?

The grid-area CSS shorthand property specifies a grid item’s size and location within a grid by contributing a line, a span, or nothing (automatic) to its grid placement, thereby specifying the edges of its grid area.

/* Keyword values */
grid-area: auto;
grid-area: auto / auto;
grid-area: auto / auto / auto;
grid-area: auto / auto / auto / auto;

/* <custom-ident> values */
grid-area: some-grid-area;
grid-area: some-grid-area / another-grid-area;

/* <integer> && <custom-ident>? values */
grid-area:  4 some-grid-area;
grid-area:  4 some-grid-area / 2 another-grid-area;

/* span && [ <integer> || <custom-ident> ] values */
grid-area: span 3;
grid-area: span 3 / span some-grid-area;
grid-area: 2 span / another-grid-area span;

/* Global values */
grid-area: inherit;
grid-area: initial;
grid-area: unset;

grid-area: <row-start> / <column-start> / <row-end> / <column-end>

Source: https://developer.mozilla.org/en-US/docs/Web/CSS/grid-area