woocommerce get product id

$product = wc_get_product( $post_id );

$product->get_regular_price();
$product->get_sale_price();
$product->get_price();

global $product;
$product->get_id();

$id = 42;
if( $term = get_term_by( 'id', $id, 'product_cat' ) ){
    echo $term->name;
}

$terms = get_the_terms( $product_id, 'product_cat' );
foreach ($terms as $term) {
    $product_cat_id[] = $term->term_id;
}