Entity and Field Details

entity_details.php

use Drupal\node\Entity\Node;
$entity = Node::load(1183);
$fields = array_keys($entity->getFieldDefinitions());
dpm($fields);
foreach($fields as $field_name) {
  dpm("Field Name");
  dpm($field_name);
  dpm("--------------");
  dpm("Field Value");
  dpm($entity->get($field_name)->value);
  dpm("--------------");
  dpm("Target Id");
  dpm($entity->get($field_name)->target_id);
  dpm("--------------");
  dpm("Array Keys of Entity");
  dpm(array_keys((array)$entity->get($field_name)->entity));
  dpm("#########################################################");
}

// More details on https://drupal.stackexchange.com/a/231314/4876. Checkout answer by Berdir