diff --git a/config/packages/api_platform.yaml b/config/packages/api_platform.yaml
index ef6e2a5fed..5b7c7f16b7 100644
--- a/config/packages/api_platform.yaml
+++ b/config/packages/api_platform.yaml
@@ -13,7 +13,7 @@ api_platform:
         json:
             mime_types: ['application/json']
         html:
-            mime_types: ['text/html' ]
+            mime_types: ['text/html']
         graphql:
             mime_types: ['application/graphql']
     collection:
diff --git a/src/CoreBundle/Entity/Course.php b/src/CoreBundle/Entity/Course.php
index f8bd7db1e3..080124781b 100644
--- a/src/CoreBundle/Entity/Course.php
+++ b/src/CoreBundle/Entity/Course.php
@@ -57,17 +57,15 @@ class Course extends AbstractResource implements ResourceInterface, ResourceWith
     public const HIDDEN = 4;
 
     /**
-     * @var int
-     *
      * @Groups({"course:read", "course_rel_user:read"})
      * @ORM\Column(name="id", type="integer", nullable=false, unique=false)
      * @ORM\Id
      * @ORM\GeneratedValue(strategy="AUTO")
      */
-    protected $id;
+    protected int $id;
 
     /**
-     * @var string The course title
+     * The course title.
      *
      * @Assert\NotBlank(message="A Course requires a title")
      *
@@ -75,10 +73,11 @@ class Course extends AbstractResource implements ResourceInterface, ResourceWith
      *
      * @ORM\Column(name="title", type="string", length=250, nullable=true, unique=false)
      */
-    protected $title;
+    protected string $title;
 
     /**
-     * @var string
+     * The course code.
+     *
      * @Assert\NotBlank()
      * @ApiProperty(iri="http://schema.org/courseCode")
      * @Groups({"course:read", "course:write", "course_rel_user:read"})
@@ -91,7 +90,7 @@ class Course extends AbstractResource implements ResourceInterface, ResourceWith
      * )
      * @ORM\Column(name="code", type="string", length=40, nullable=false, unique=true)
      */
-    protected $code;
+    protected string $code;
 
     /**
      * @var CourseRelUser[]|ArrayCollection
@@ -118,7 +117,10 @@ class Course extends AbstractResource implements ResourceInterface, ResourceWith
     /**
      * @var ArrayCollection|AccessUrlRelCourse[]
      *
-     * @ORM\OneToMany(targetEntity="Chamilo\CoreBundle\Entity\AccessUrlRelCourse", mappedBy="course", cascade={"persist", "remove"}, orphanRemoval=true)
+     * @ORM\OneToMany(
+     *     targetEntity="Chamilo\CoreBundle\Entity\AccessUrlRelCourse",
+     *     mappedBy="course", cascade={"persist", "remove"}, orphanRemoval=true
+     * )
      */
     protected $urls;
 
@@ -221,11 +223,9 @@ class Course extends AbstractResource implements ResourceInterface, ResourceWith
     protected $courseLanguage;
 
     /**
-     * @var string
-     *
      * @ORM\Column(name="description", type="text", nullable=true, unique=false)
      */
-    protected $description;
+    protected string $description;
 
     /**
      * @var ArrayCollection
@@ -393,7 +393,7 @@ class Course extends AbstractResource implements ResourceInterface, ResourceWith
         $this->creationDate = new \DateTime();
         $this->lastVisit = new \DateTime();
         $this->lastEdit = new \DateTime();
-
+        $this->description = '';
         $this->users = new ArrayCollection();
         $this->urls = new ArrayCollection();
         $this->tools = new ArrayCollection();
diff --git a/src/CoreBundle/Entity/Session.php b/src/CoreBundle/Entity/Session.php
index 7a6fbb4290..05dbf2121d 100644
--- a/src/CoreBundle/Entity/Session.php
+++ b/src/CoreBundle/Entity/Session.php
@@ -22,6 +22,18 @@ use Symfony\Component\Validator\Constraints as Assert;
  *     attributes={"security"="is_granted('ROLE_ADMIN')"},
  *     normalizationContext={"groups"={"session:read"}, "swagger_definition_name"="Read"},
  *     denormalizationContext={"groups"={"session:write"}},
+ *     collectionOperations={
+ *         "get" = {
+ *              "denormalization_context"={
+ *                  "groups"={"session:read"},
+ *              },
+ *         },
+ *         "post"={}
+ *      },
+ *      itemOperations={
+ *          "get"={},
+ *          "put"={},
+ *     }
  * )
  *
  * @ApiFilter(SearchFilter::class, properties={"name": "partial"})
@@ -57,7 +69,7 @@ class Session
      * @ORM\Id
      * @ORM\GeneratedValue()
      */
-    protected $id;
+    protected int $id;
 
     /**
      * @var ArrayCollection|SkillRelCourse[]
@@ -128,20 +140,18 @@ class Session
     protected $currentUrl;
 
     /**
-     * @var string
      * @Assert\NotBlank()
      * @Groups({"session:read", "session:write", "session_rel_course_rel_user:read"})
      * @ORM\Column(name="name", type="string", length=150, nullable=false, unique=false)
      */
-    protected $name;
+    protected string $name;
 
     /**
-     * @var string
      * @Groups({"session:read", "session:write"})
      *
      * @ORM\Column(name="description", type="text", nullable=true, unique=false)
      */
-    protected $description;
+    protected string $description;
 
     /**
      * @var bool
@@ -302,6 +312,7 @@ class Session
         $this->items = new ArrayCollection();
         $this->urls = new ArrayCollection();
 
+        $this->description = '';
         $this->nbrClasses = 0;
         $this->nbrUsers = 0;
         $this->sendSubscriptionNotification = false;
@@ -630,12 +641,8 @@ class Session
 
     /**
      * Set description.
-     *
-     * @param string $description
-     *
-     * @return $this
      */
-    public function setDescription($description)
+    public function setDescription(string $description): self
     {
         $this->description = $description;
 
@@ -644,10 +651,8 @@ class Session
 
     /**
      * Get description.
-     *
-     * @return string
      */
-    public function getDescription()
+    public function getDescription(): string
     {
         return $this->description;
     }
diff --git a/src/CoreBundle/Entity/User.php b/src/CoreBundle/Entity/User.php
index 1782cc2de6..5a50ce31bd 100644
--- a/src/CoreBundle/Entity/User.php
+++ b/src/CoreBundle/Entity/User.php
@@ -32,11 +32,13 @@ use Symfony\Component\Validator\Mapping\ClassMetadata;
  *      iri="http://schema.org/Person",
  *      normalizationContext={"groups"={"user:read"}},
  *      denormalizationContext={"groups"={"user:write"}},
- *      collectionOperations={"get"},
+ *      collectionOperations={
+ *         "get"={},
+ *         "post"={}
+ *      },
  *      itemOperations={
  *          "get"={},
  *          "put"={},
- *          "delete"={},
  *     }
  * )
  *
@@ -266,7 +268,7 @@ class User implements UserInterface, EquatableInterface, ResourceInterface, Reso
     /**
      * @var CourseRelUser[]|ArrayCollection
      *
-     * @ApiSubresource()
+     * @ApiSubresource
      * @ORM\OneToMany(targetEntity="Chamilo\CoreBundle\Entity\CourseRelUser", mappedBy="user", orphanRemoval=true)
      */
     protected $courses;
diff --git a/src/CoreBundle/Resources/config/repositories.yml b/src/CoreBundle/Resources/config/repositories.yml
index 06d9312e83..e427f454cd 100644
--- a/src/CoreBundle/Resources/config/repositories.yml
+++ b/src/CoreBundle/Resources/config/repositories.yml
@@ -28,8 +28,8 @@ services:
     Chamilo\CoreBundle\Repository\Node\UserRepository:
         calls:
             - setEncoder: ['@security.user_password_encoder.generic']
-            - setAuthorizationChecker: [ '@security.authorization_checker']
+            - setAuthorizationChecker: ['@security.authorization_checker']
             - setRouter: ['@router']
             - setSlugify: ['@cocur_slugify']
             - setToolChain: ['@Chamilo\CoreBundle\ToolChain']
-            - setResourceNodeRepository: [ '@Chamilo\CoreBundle\Repository\ResourceNodeRepository']
+            - setResourceNodeRepository: ['@Chamilo\CoreBundle\Repository\ResourceNodeRepository']