How can we position elements using grid lines? What is the shorthand version for this?

The grid-row-start CSS property specifies a grid item’s start position within the grid row by contributing a line, a span, or nothing (automatic) to its grid placement, thereby specifying the inline-start edge of its grid area.

/* Keyword value */
grid-row-start: auto;

/* <custom-ident> values */
grid-row-start: somegridarea;

/* <integer> + <custom-ident> values */
grid-row-start: 2;
grid-row-start: somegridarea 4;

/* span + <integer> + <custom-ident> values */
grid-row-start: span 3;
grid-row-start: span somegridarea;
grid-row-start: 5 somegridarea span;

/* Global values */
grid-row-start: inherit;
grid-row-start: initial;
grid-row-start: unset;

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

The grid-row-end CSS property specifies a grid item’s end position within the grid row by contributing a line, a span, or nothing (automatic) to its grid placement, thereby specifying the inline-end edge of its grid area.

Like grid-row-start.

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

The grid-column-start CSS property specifies a grid item’s start position within the grid column by contributing a line, a span, or nothing (automatic) to its grid placement. This start position defines the block-start edge of the grid area.

Like grid-row-start.

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

The grid-column-end CSS property specifies a grid item’s end position within the grid column by contributing a line, a span, or nothing (automatic) to its grid placement, thereby specifying the block-end edge of its grid area.

Like grid-row-start.

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

Shorthand version

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

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

/* <custom-ident> values */
grid-row: somegridarea;
grid-row: somegridarea / someothergridarea;

/* <integer> + <custom-ident> values */
grid-row: somegridarea 4;
grid-row: 4 somegridarea / 6;

/* span + <integer> + <custom-ident> values */
grid-row: span 3;
grid-row: span somegridarea;
grid-row: 5 somegridarea span;
grid-row: span 3 / 6;
grid-row: span somegridarea / span someothergridarea;
grid-row: 5 somegridarea span / 2 span;

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

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

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

Like grid-row.

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