diff --git a/web/modules/custom/yufu_concept/src/Plugin/rest/resource/AddConcept.php b/web/modules/custom/yufu_concept/src/Plugin/rest/resource/AddConcept.php
new file mode 100644
index 0000000..1d8800d
--- /dev/null
+++ b/web/modules/custom/yufu_concept/src/Plugin/rest/resource/AddConcept.php
@@ -0,0 +1,163 @@
+<?php
+
+namespace Drupal\yufu_concept\src\Plugin\rest\resource;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\TypedData\Exception\MissingDataException;
+use Drupal\rest\Plugin\ResourceBase;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Mail\MailManagerInterface;
+use Drupal\rest\ResourceResponse;
+use Drupal\Core\Session\AccountProxyInterface;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+
+
+
+/**
+ * Creates post endpoint to create new concept.
+ *
+ * @RestResource(
+ *   id = "add_concept_rest_resource",
+ *   label = @Translation("Create or edit a concept"),
+ *   uri_paths = {
+ *     "canonical" = "/api/pojem/dodaj"
+ *   }
+ */
+class AddConcept extends ResourceBase {
+
+    /**
+   * A current user instance.
+   *
+   * @var \Drupal\Core\Session\AccountProxyInterface
+   */
+  protected $currentUser;
+
+  /**
+   * Mail manager service.
+   *
+   * @var \Drupal\Core\Mail\MailManagerInterface
+   */
+  protected $mailManager;
+
+  /**
+   * Site configs.
+   *
+   * @var \Drupal\Core\Config\ImmutableConfig
+   */
+  protected $config;
+
+  /**
+   * Entity type manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * Constructs a Drupal\rest\Plugin\ResourceBase object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param array $serializer_formats
+   *   The available serialization formats.
+   * @param \Psr\Log\LoggerInterface $logger
+   *   A logger instance.
+   * @param \Drupal\Core\Session\AccountProxyInterface $current_user
+   *   A current user instance.
+   * @param \Drupal\Core\Mail\MailManagerInterface $mailManager
+   *   Mail manager service.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $configFactory
+   *   Config factory service.
+   */
+  public function __construct(
+    array                  $configuration,
+                           $plugin_id,
+                           $plugin_definition,
+    array                  $serializer_formats,
+    LoggerInterface        $logger,
+    AccountProxyInterface  $current_user,
+    MailManagerInterface   $mailManager,
+    ConfigFactoryInterface $configFactory,
+    EntityTypeManagerInterface $entity_type_manager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $serializer_formats, $logger);
+    $this->currentUser = $current_user;
+    $this->mailManager = $mailManager;
+    $this->config = $configFactory->get('system.site');
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->getParameter('serializer.formats'),
+      $container->get('logger.factory')->get('custom_rest'),
+      $container->get('current_user'),
+      $container->get('plugin.manager.mail'),
+      $container->get('config.factory'),
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * Send a test email.
+   *
+   * @param $data
+   *   Post date.
+   *
+   * @return \Drupal\rest\ResourceResponse
+   *  Returns rest resource.
+   */
+  public function post($data) {
+    $response_status['status'] = FALSE;
+    // You must to implement the logic of your REST Resource here.
+    // Use current user after pass authentication to validate access.
+    if (!$this->currentUser->hasPermission('access content')) {
+      throw new AccessDeniedHttpException();
+    }
+    // Fields: naslov, text, povezani pojmi, email
+    // Optional fields: language, related concept.
+    if (!empty($data['title']) && !empty($data['text'])) {
+      throw new MissingDataException('Title or text missing.');
+    }
+    $concept = [
+      'type' => 'concept',
+      'title' => $data['title'],
+      'body' => $data['text'],
+    ];
+    // @TODO Check if related concepts are set and add them to the concept.
+    // @TODO Check language and add set it on concept if exists.
+    $concept = $this->entityTypeManger->getStorage('node')->create($concept);
+    $concept->save();
+
+    if (!empty($data['email'])) {
+      // @TODO Poslji mail uporabniku, da se lahko registrira.
+      $site_email = $this->config->get('mail');
+      $module = 'yufu_concept';
+      $key = 'notice';
+      $to = $site_email;
+      // Send email to user to make him register to the website.
+      $params['message'] = $data['message']['value'];
+      $params['title'] = $data['subject']['value'];
+      $params['from'] = $data['email']['value'];
+      $langcode = $data['lang']['value'];
+      $send = TRUE;
+
+      $result = $this->mailManager->mail($module, $key, $to, $langcode, $params, NULL, $send);
+      $response_status['status'] = $result['result'];
+    }
+    $response = new ResourceResponse($response_status);
+    return $response;
+  }
+
+}
diff --git a/web/modules/custom/yufu_concept/tests/local-emacs-test.rest b/web/modules/custom/yufu_concept/tests/local-emacs-test.rest
new file mode 100644
index 0000000..daaa1c3
--- /dev/null
+++ b/web/modules/custom/yufu_concept/tests/local-emacs-test.rest
@@ -0,0 +1,12 @@
+# _*_ restclient _*_
+
+# Makes post http request to a resource from yufu_concept module.
+
+POST https://yufu-manifest.ddev.site/api/pojem/dodaj
+User-Agent: Emacs Restclient
+Content-Type: application/json
+
+{
+"title": "Emacs restclient test",
+"body": "O wau. Emacs restclient. How nice."
+}
\ No newline at end of file
diff --git a/web/modules/custom/yufu_concept/yufu_concept.info.yml b/web/modules/custom/yufu_concept/yufu_concept.info.yml
new file mode 100644
index 0000000..cfc664a
--- /dev/null
+++ b/web/modules/custom/yufu_concept/yufu_concept.info.yml
@@ -0,0 +1,7 @@
+name: Yufu Concept
+type: module
+description: Provides concept content type related functionality.
+package: Yufu
+core_version_requirement: ^9 || ^10
+dependencies:
+  - drupal:rest
diff --git a/web/modules/custom/yufu_concept/yufu_concept.module b/web/modules/custom/yufu_concept/yufu_concept.module
new file mode 100644
index 0000000..0a8a750
--- /dev/null
+++ b/web/modules/custom/yufu_concept/yufu_concept.module
@@ -0,0 +1,6 @@
+<?php
+
+/**
+ * @file
+ * Primary module hooks for Yufu Concept module.
+ */