Module development and code questions

Buenas noches estoy usabdo commerce 2 y drupal8 y quisiera saber si existe algun metodo para enviar la factura del pedido del cliente por email igual que lo hace ubercart???

i am beginner at Drupal 9, I am using Durpal 9, how can i create module content type news , with fields title, body,image and rank. Rank is integer number, and bigger number in field rank put news first. I have to create module from scratch. Which function i need to use, what code, is there any example like this?

When creating a custom form, I learned that adding a service to a form via dependency injection should be done like the below using the constructor....

Goodnight I am using commerce in drupal 8 and it really is much better than ubercart but something is happening to me when I enable the promotions and add the coupons, when the client adds said coupon it gives me an error The provided coupon code is invalid. What could be causing this?

We had installed SSL certificates in my Drupal project in AWS server, the website works fine with https. In this site we had configured our custom wallee module which is using Drupal Wallee SDK for payment transaction related functions. But while trying to initiate a new payment transaction below SSL certificate problem is triggering.

error setting certificate verify locations: CAfile: /var/www/html/walle/vendor/wallee/sdk/lib/ca-bundle.crt CApath: none

Dear All, 

I have entity bundle: "trainings" and dropdown field is training_type. How can i get the defaule values of this field.

i can get the selected value code but i need to get all default values in order to show the label.

Thanking you in advance.