Paragraphs

Create a paragraph

use Drupal\node\Entity\Node;
use Drupal\paragraphs\Entity\Paragraph;         

$paragraph_1 = Paragraph::create([
    'type' => 'paragraph_type_1', //machine name of paragraph
    'field_text' => [
      'value' => 'Some text',
      'format' => 'full_html',
    ],
]);
        
$paragraph_1->save();

Create a nested paragraph