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Creating a Block in Drupal 10 Programmatically

Drupal's great feature is Custom Block. blocks are easy and fast to set in any region, with Drupal9 you can even set the same block in a few regions.
There are a few technical options to create a block, here we will overview the programming option only.
so, what is a block?
Blocks are chunks of content with ID and classes which can be placed in manipulated within the page. 

namespace Drupal\my_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Block\BlockPluginInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Cache\UncacheableDependencyTrait;

/**
 * Provides a 'SetTask' Block.
 *
 * @Block(
 *   id = "dashboard_newtask_block",
 *   admin_label = @Translation("Dashboard New Task"),
 *   category = @Translation("DrupalVIP"),
 * )
 */
class NewTaskBlock extends BlockBase implements BlockPluginInterface {
    use UncacheableDependencyTrait;
    
    /**
    * {@inheritdoc}
    */
    public function build() {
        // Do NOT cache a page with this block on it.
        \Drupal::service('page_cache_kill_switch')->trigger(); 
        // build from form               
        $build = \Drupal::formBuilder()->getForm('Drupal\drupalvip_dashboard\Form\NewTaskForm');
        $build['#attributes']['class'][] = 'my_class';
        $build['#cache']['max-age'] = 0;
        $build['#cache']['contexts'] = [];
        $build['#cache']['tags'] = [];                   
        return $build;
    }       
  
    /**
    * {@inheritdoc}
    */
    public function blockForm($form, FormStateInterface $form_state) {
        $form = parent::blockForm($form, $form_state);
        $config = $this->getConfiguration();
        $form['block_note'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Note'),
            '#description' => $this->t('block note '),
            '#default_value' => isset($config['block_note']) ? $config['block_note'] : '',
        ];
        return $form;
    }  

    /**
    * {@inheritdoc}
    */
    public function blockSubmit($form, FormStateInterface $form_state) {
        parent::blockSubmit($form, $form_state);        
        $values = $form_state->getValues();
        $this->configuration['block_note'] = $values['block_note'];
    }    
    
} // end of class

How to share Drupal content via Facebook with correct images

When you share a post of your drupal site on facebook, it will automatically detect the images of your node for you to choose.

But sometimes, it does not detect any images, or the detected images are not what you want. 

You can always upload the main image manually. That's fine, because you are the owner of the site, you know which ones to choose. However, if your readers share that piece of content and it has an ugly image, it does not look attracting at all.

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