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How To Attach Library To A Specific Content Type

If you need to upload a library with a module during its operation, in Drupal it's called attaching file.
Attaching a library can be done in several ways depending on your needs.
Remember that the library is always registered by its module or theme name followed by the library name.

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Code Snippet

function rwcenter_page_attachments(array &$attachments) {
	$attachments['#attached']['library'][] = 'rwcenter/content';
        
    $node = \Drupal::routeMatch()->getParameter('node') ?? \Drupal::routeMatch()->getParameter('node_preview');
    if (is_null($node)) {}
    else {
    	if ($node->getType()=='rwcenter') {
        	$attachments['#attached']['library'][] = 'rwcenter/content';
        }
    }        
}

Adding assets (CSS, JS) to a Drupal module via *.libraries.yml

In Drupal 8 and later versions, stylesheets (CSS) and JavaScript (JS), jQuery, React, and even Angular, are loaded through the same system for modules (code) and themes, for everything: asset libraries.

Asset libraries can contain one or more CSS assets, one or more JS assets, and one or more JS settings.

Drupal uses a high-level principle: assets (CSS or JS) are only loaded if you tell Drupal it should load them.

Drupal does not load all assets (CSS/JS) on all pages because this is bad for front-end performance.