wp_query category in by title code example

Example: category name wp query

$query = new WP_Query( array( 'category_name' => 'staff' ) );

cat (int) – use category id.
category_name (string) – use category slug.
category__and (array) – use category id.
category__in (array) – use category id.
category__not_in (array) – use category id.