Module development and code questions

Hello Guys
I need to set Email-Field in registration page "Not Required".
In fact I want users would be able to register with only username_field and password_field.

Thanks

I'm am trying to write a module that will assign a role to a user on once they have purchased a product (Drupal 8.8.2, commerce 8.x-2.16). I have googled and there are bits and pieces (e.g. "write a new class called an event subscriber to assign that user role on the "placed" transition") that suggest how this could be done.

Hello,

We are creating a mobile game and we're evaluating Drupal for the back end.  We want to use Drupal to store the accounts and use Game Center for iOS and Google Play Games for Android to authenticate the user.

Has anyone done this and can someone send me in the right direction for a link or tutorial for this?

Thank you in advance.

Clint

Hi,

I am using Mpdf to download texts in pdf format. All the texts that are in english are getting downloaded properly. But I have texts in other languages, after download they show garbage. 

Please let me know how this can be fixed. Thanks

I have a content type which has a taxonomy term field called 'field_uni_taxonomy'
How can I print the value of this field in my template on the front end?

Seems, that Embed Video doesn't work with Youtube. I inserted code in field and published it. But I have blank screen. Only title. This trouble not with browser.