Drupal 8 typical entityQuery example with reference entities field example and

/**
 * @param $vars
 * Load a view into pages and an entityQuery
 */

function yourmoduleORthemename_preprocess_page(&$variables) {
  // EntityQuery blogs.
  $query = \Drupal::entityQuery('node')
    ->condition('status', 1)
    ->condition('type', 'your_bundle')
//  ->condition('field_some_field', 14);
//  ->condition('field_some_field', ['target_id' = id]);
    ->sort('created', 'DESC');

  $nids = $query->execute();


  if (!empty($nids)) {
    $nodes = Node::loadMultiple($nids);
    $view_builder = \Drupal::entityTypeManager()->getViewBuilder(reset($nodes)->getEntityTypeId());
    $nodes_views = $view_builder->viewMultiple($nodes, 'teaser');
  }
  $variables['blog'] = $nodes_views;
}