Add Widget To Genesis Child Theme https://wpsites.net/web-design/display-genesis-featured-page-widgets-in-columns-using-css-grid/

functions.php

genesis_register_sidebar( array(
    'id' => 'css-grid-widget',
    'name' => __( 'Grid Widget', 'genesis' ),
) );

add_action( 'genesis_before_content_sidebar_wrap', 'front_page_grid_widget' );
function front_page_grid_widget() {

    genesis_widget_area( 'css-grid-widget', array(
        'before' => '<div class="grid-container">',
        'after'  => '</div>',
    ) );
    
}