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If you want to programmatically check the Pathauto's Generate automatic URL alias checkbox you can do something like this:

use Drupal\pathauto\PathautoState;

$entity_type = 'node';
$entity_storage = \Drupal::entityTypeManager()->getStorage($entity_type);
$nodes = $entity_storage->loadMultiple();

foreach($nodes as $node) {
  $node->path->pathauto = PathautoState::CREATE;
  $node->save();
}

For terms just change the entity type to this:

$entity_type = 'taxonomy_term';

To uncheck the field instead of CREATE use SKIP constant:

$node->path->pathauto = PathautoState::SKIP;

Creating a modal with a title and some content in Ajax callback is easy:

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\OpenModalDialogCommand;

public function ajaxCallback(array $form, FormStateInterface $form_state) {
  $response = new AjaxResponse();
  $response->addCommand(new OpenModalDialogCommand($this->t('Title!'), $this->t('Some content.')));
  return $response;
}

If you also want to display a button in the modal, just provide the third parameter like this:

$options = [
  'buttons' => [
    'button1' => [
      'text' => $this->t('Close'),
      'id' => 'close-button',
      'onclick' => "jQuery('.ui-icon-closethick').click()",
    ],
  ],
];

...
$response->addCommand(new OpenModalDialogCommand($this->t('Title!'), $this->t('Some content.'), $options));
...

As you can see, by clicking on this button the modal will be closed.

If you want to alter the title of the Read more link or perhaps add some CSS classes, you can do that by using the hook_node_links_alter() hook.

use Drupal\node\NodeInterface;

function MY_MODULE_node_links_alter(array &$links, NodeInterface $entity, array &$context) {
  if (!empty($links['node']['#links']['node-readmore']['title'])) {
    $links['node']['#links']['node-readmore']['title'] = t('View Details');
    $links['node']['#links']['node-readmore']['attributes']['class'][] = 'view-details-link';
  }
}

You can do this just for some content types, by checking the bundle value: if ($entity->bundle() == 'article') {}

Thanks to the hook_user_format_name_alter() hook altering the username that is displayed for a user is really easy. Let's say that you have the First and Last name fields on the user entity. You can do something like this to alter the username:

use Drupal\Core\Session\AccountInterface;
use Drupal\user\Entity\User;

/**
 * Implements hook_user_format_name_alter().
 */
function MY_MODULE_user_format_name_alter(&$name, AccountInterface $account) {
  $full_name = [];

  $account = User::load($account->id());
  $first_name = $account->get('field_first_name')->value;
  $last_name = $account->get('field_last_name')->value;

  if (!empty($first_name)) {
    $full_name[] = $first_name;
  }

  if (!empty($last_name)) {
    $full_name[] = $last_name;
  }

  if (!empty($full_name)) {
    $name = implode(' ', $full_name);
  }
}

If you now try to get the username by using this $account->getDisplayName() you will see the new username that consists of the first and last name.

Let's say that you want to override the template for the order that is defined in the Commerce Order module. If you don't have a custom Admin theme then you have to override it in a custom module.

You can't do this in the custom user-facing theme, because that theme is not used for admin pages. So, you have to find out the template name by enabling theme debug and inspecting the HTML code.

Now you can implement the hook_theme() hook like this:

/**
 * Implements hook_theme().
 */
function MY_MODULE_theme($existing, $type, $theme, $path) {
  return [
    'commerce_order__admin' => [
      'template' => 'commerce-order--admin-custom',
    ],
  ];
}

And the last step is to create a new Twig template in your custom module: MY_MODULE/templates/commerce-order--admin-custom.html.twig