Module development and code questions

Using contrib module search api, I use also the format "Entity (Search API)" in order to generate my rest export result of view.

And i get the result below. I want to know

Hello,
I have a situation where I have a custom field (myfield) that was initially defined in Module 1. Some fields have been created with it. That field is now defined in Module 2 instead (i.e. Module 1 no longer defines or does anything with that field).

The problem I'm having is that, despite everything about the field being exactly the same, I can't uninstall Module 1 because it thinks there are fields that require it. If I create a new field of type myfield, it correctly assumes it is part of Module 2.

Hi Guys, 
I'm using xmlrpc_encode_request() this method in Drupal 7 and now I migrated my site to Drupal 9 and I want to use this method. How to use the same ? 
I'm using like this: 

I'm upgrading my theme and I use a combination of Paragraphs module and an Image Field. Previously, I had a function to get the default image. $field_name is the `field_image`:

  $field_definition = $variables['paragraph']->getFieldDefinition($field_name);
$uuid = $field_definition->getSetting('default_image')['uuid'];
$files = \Drupal::entityTypeManager()->getStorage('file')->loadByProperties(['uuid' => $uuid]);
if (count($files)) {
$file = reset($files);
return $file;
}

Hello,

I like to add a placeholder "Enter your name" to the "Your Name" text field of the feedback form using a twig template. 

Below worked for the email field. 

File Name: input--email.html.twig
Directory: themes/mytheme/templates/form

I've been working with address module (Version: 8.x-1.12) and I've been able to figure out how to override subdivisions based off of the example (https://docs.drupalcommerce.org/commerce2/developer-guide/customers/addr...) of adding the UK counties using GreatBritainEventSubscriberas a guide.