Vendo o uso de grid-row-start e grid-row-end, e também grid-column-start e grid-column-end
Vendo o uso dos shorthands de grid-row e grid-column
grid-row: start / end
grid-column: start / end
Vendo o uso do shorthand grid-area
grid-area: grid-row-start / grid-column-start / grid-row-end / grid-columnd-end