If you want to remove related products from product page in WooCommerce then place the following code in your functions.php file.

function wc_remove_related_products( $args ) {
	return array();
}
add_filter('woocommerce_related_products_args','wc_remove_related_products', 10); 

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If you want to get number of items in a WooCommerce cart then you can place the following code in your file.

global $woocommerce;
$count=$woocommerce->cart->cart_contents_count;

Here $count having total number of items in your WooCommerce cart.
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You can fetch shipping address by using WC_Order object and get_shipping_address() from order id.
Use the following code to fetch shipping address from order ID.

$order = new WC_Order( $order_id );
$shipping_address=$order->get_shipping_address();

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You can fetch billing address by using WC_Order object and get_billing_address() from order id.
Use the following code to fetch billing address from order ID.

$order = new WC_Order( $order_id );
$billing_address=$order->get_billing_address();

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You can use the WC_Order object for get order date from order id.
if you have the order ID then use the following code to fetch order date.

$order = new WC_Order($order_id);
$order_date = $order->order_date;

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You can fetch all WooCommerce orders of a single customer by different parameter.
Here you can find all WooCommerce orders of a customer by user id.
Use the following to fetch all orders of a single customer in WooCommerce by user ID.
You have to replace customer id instead of ‘CUSTOMER_USER_ID_HERE’.

$user_id='CUSTOMER_USER_ID_HERE';
$customer_orders = get_posts( array(
                    'meta_key'    => '_customer_user',
                    'meta_value'  => $user_id,
                    'post_type'   => 'shop_order',
                    'post_status' => array_keys( wc_get_order_statuses() ),
                    'numberposts' => -1
                ));

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You can fetch all WooCommerce orders of a single customer by different parameter.
Here you can find all orders of a customer by email id.
Use the following to fetch all orders of a single customer in WooCommerce by email ID.
You have to replace customer email id instead of ‘CUSTOMER_EMAIL_ID_HERE’.

$billing_email='CUSTOMER_EMAIL_ID_HERE';
$customer_orders = get_posts( array(
                    'meta_key'    => '_billing_email',
                    'meta_value'  => $billing_email,
                    'post_type'   => 'shop_order',
                    'post_status' => array_keys( wc_get_order_statuses() ),
                    'numberposts' => -1
                ));

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There are several ways to get all WooCommerce Orders for a Customer.
Here you can get all Woocommerce orders for a customer by customer email id.
Use the following code to fecth WooCommerce orders for a customer.
The following code will fecth all orders for a current user.

$customer_orders = get_posts( array(    
    'meta_key'    => '_customer_user',
    'meta_value'  => get_current_user_id(),
    'post_type'   => 'shop_order',
    'post_status' => array_keys( wc_get_order_statuses() ),
    'numberposts' => -1
) );

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If you want to change default product visibility in woocommerce then add that following code in your functions.php file.
Here instead of “hidden” change your default visibility values.

function filter_woocommerce_product_visibility_default( $visible ) { 
    return "hidden"; 
	//return your default value here
}; 
add_filter( 'woocommerce_product_visibility_default', 'filter_woocommerce_product_visibility_default', 10, 1 );

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If you want to remove woocommerce product tabs programmatically in WordPress then add that following code in your functions.php file.
Here “woocommerce_product_tabs” filter is used for alter woocommerce product tabs.

add_filter( 'woocommerce_product_tabs', 'woocommerce_remove_product_tabs', 98 );
function woocommerce_remove_product_tabs( $tabs ) {

    unset( $tabs['description'] );      	// Remove the description tab
    unset( $tabs['reviews'] ); 			// Remove the reviews tab
    unset( $tabs['additional_information'] );  	// Remove the additional information tab
    return $tabs;
}

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