how it's possible to load nodes by taxonomy terms
In Drupal 7 conditions are deprecated, it is preferable to use EntityFieldQuery to retrieve a list of entity IDs. You can see more here: 
About EntityFieldQuery

In this answer you can see an example: What&#39;s the proper use of EntityFieldQuery?

In Drupal 8 you can do something like that:

$nids = \Drupal::entityQuery('node')
-&gt;condition('your_taxonomy_field', 'your taxonomy id')
-&gt;execute();
$nodes = \Drupal\node\Entity\Node::loadMultiple($nids);


I hope it helps