Can anyone tell me how to add custom fields on the registration page as I am having an error in the code

function wooc_validate_extra_register_fields( $username, $email, $validation_errors ) {
      if ( isset( $_POST['billing_first_name'] ) && empty( $_POST['billing_first_name'] ) ) {
             $validation_errors->add( 'billing_first_name_error', __( '<strong>Error</strong>: First name is required!', 'woocommerce' ) );
      }
      if ( isset( $_POST['billing_last_name'] ) && empty( $_POST['billing_last_name'] ) ) {
             $validation_errors->add( 'billing_last_name_error', __( '<strong>Error</strong>: Last name is required!.', 'woocommerce' ) );
      }
         return $validation_errors;
}
add_action( 'woocommerce_register_post', 'wooc_validate_extra_register_fields', 10, 3 );

The reference tutorial I have see WooCommerce form and implemented all the steps following this tutorial 

I think we can't compare Cloud hosting and VPS as they both have their own features and specialties. I was using a shared hosting for my store and now recently I have migrated to cloud WooCommerce hosting and I have personally realized the difference using shared and cloud hosting. 

I have recently migrated my store to Cloudways going through their migrate WooCommerce tutorial and now I am thinking to check out opencart as well but I am not sure whether I will create a new store or I will migrate that because might be it affect on my revenue migrating a huge store. What you suggest? Should I go for a trial and launch a demo store to see how it works?

Can any one suggest for the facebook pixel code if they have implemented this or how we can do the setup also, how to add the product feed in facebooks ads manager. Once extension is here - it seems to be good but not sure - https://www.opencart...ension_id=28804

I think you can see a tutorial to install facebook pixel after that you can easily implement the steps that mention in the tutorial