diff --git a/README.md b/README.md
index c9c4373..804becf 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,84 @@
 # JSON:API Resource for Laravel
+
 Make your Laravel API [JSON:API](https://jsonapi.org/) compliant with the `Brainstud\JsonApi` package.
 
+
+## Usage
+
+Install the package with Composer:
+
+```bash
+composer require brainstud/json-api-resource
+```
+
+After that, you can create new resources that extend the `JsonApiResource` of this package.
+
+```php
+// Post.php
+class Post extends Model {
+       protected $fillable = [
+        'title',
+        'content',
+    ];
+
+
+    public function comments(): HasMany
+    {
+        return $this->hasMany(Comment::class);
+    }
+
+}
+
+
+// PostResource.php
+class PostResource extends JsonApiResource {
+
+  protected function register() {
+     $data = [
+         'id' => $this->resourceObject->identifier,
+         'type' => 'posts',
+         'attributes' => [
+            'title' => $this->resourceObject->title,
+            'content' => $this->resourceObject->content,
+         ],   
+         'relationships' => ['comments', CommentCollectionResource::class]
+     ];  
+    
+     return $data; 
+  }
+}
+
+// PostCollectionResource.php
+class PostCollectionResource extends JsonApiCollectionResource {
+
+    public $collects = PostResource::class;
+
+}
+
+// PostController.php
+class PostController extends Controller {
+
+    public function index(){
+         $posts = Post::all()->load('comments');
+         return new PostCollectionResource($posts);
+    }
+
+    public function show (Post $post) {
+         return new PostResource($post->load('comments'));
+    }
+}
+```
+
+
+
+
+
+
+
+
+
+
+
 ## Example usage
 ```php
 // Course.php
diff --git a/src/Resources/JsonApiResource.php b/src/Resources/JsonApiResource.php
index 4e55aad..0f916e2 100644
--- a/src/Resources/JsonApiResource.php
+++ b/src/Resources/JsonApiResource.php
@@ -15,6 +15,25 @@ abstract class JsonApiResource extends JsonResource
      */
     protected mixed $resourceObject;
 
+
+    /**
+     * Prevent specific properties from the model to be published in the resource.
+     * @var $except string[]
+     */
+    protected array $except;
+
+    /**
+     * Select specific attributes from the model of the resource.
+     * @var $only string[]
+     */
+    protected array $only;
+
+    /**
+     * Overwrite model key where the model is identified by within the resource (e.g. `identifier` or `id`).
+     * @var string $identifiedBy
+     */
+    protected string $identifiedBy;
+
     /**
      * The registered resource data
      * @var array
@@ -66,7 +85,7 @@ public function __construct($jsonApiResourceData)
         $this->resourceDepth =  $resourceDepth ?? 0;
         $this->resourceObject = $resource;
         $this->resourceRegistrationData = $this->register();
-        $this->resourceKey = "{$this->resourceRegistrationData['type']}.{$this->resourceRegistrationData['id']}";
+        $this->resourceKey = "{$this->getType()}.{$this->getId()}";
 
         if ($this->resourceDepth < $this->maxResourceDepth) {
             $this->mapRelationships();
@@ -83,6 +102,54 @@ public function __construct($jsonApiResourceData)
      */
     abstract protected function register(): array;
 
+    /**
+     * toId.
+     *
+     * When string is returned, it will be set as the JSON:API `id` property.
+     * @return string|null
+     */
+    protected function toId(): null | string {
+        return null;
+    }
+
+    /**
+     * getId.
+     *
+     * Returns the id of the resource.
+     * @return string
+     */
+    protected function getId(): string {
+        return (
+            $this->toId()
+            ?? $this->resourceRegistrationData['id']
+            ?? $this->resourceObject->{$this->identifiedBy ?? $this->resourceObject->getRouteKeyName()}
+        );
+    }
+
+    /**
+     * toType.
+     *
+     * When string is returned, it will be set as the JSON:API `type` property.
+     * @return string|null
+     */
+    protected function toType(): null | string {
+        return null;
+    }
+
+    /**
+     * getType.
+     *
+     * Returns the type of the resource.
+     * @return string
+     */
+    protected function getType(){
+        return (
+            $this->toType() ??
+            $this->resourceRegistrationData['type'] ??
+            Str::snake(Str::plural(class_basename($this->resourceObject)))
+        );
+    }
+
 
     /**
      * Build the response
@@ -96,8 +163,8 @@ public function toArray($request): array
         }
 
         $response = [
-            'id' => $this->resourceRegistrationData['id'],
-            'type' => $this->resourceRegistrationData['type'],
+            'id' => $this->resourceObject->{$this->identifiedBy ?? $this->resourceObject->getRouteKeyName()},
+            'type' => $this->getType(),
             'attributes' => $this->getAttributes($request),
         ];
 
@@ -277,6 +344,8 @@ private function addInclude(JsonApiResource $includedResource): self {
      *
      * Merges two similar resources together.
      *
+     * TODO: Make sure this combine method works with dynamic attributes (`only`, `except`, `toAttributes`).
+     *
      * @param JsonApiResource|null $second
      * @return JsonApiResource
      */
@@ -301,6 +370,18 @@ public function getIncludedResources(): Collection {
         return collect(array_values($this->included));
     }
 
+    /**
+     * toAttributes.
+     *
+     * When an array is returned, it will set the attributes of the resource to that array.
+     *
+     * @param Request $request
+     * @param $model
+     * @return array|null
+     */
+    protected function toAttributes(Request $request, $model): ?array {
+        return null;
+    }
 
     /**
      * getAttributes.
@@ -312,17 +393,46 @@ public function getIncludedResources(): Collection {
      */
     private function getAttributes(Request $request)
     {
-        $attributes = $this->resourceRegistrationData['attributes'];
-        $type = $this->resourceRegistrationData['type'];
-
-        if (!($fieldSet = $request->query('fields'))
-            || !array_key_exists($type, $fieldSet)
-            || !($fields = explode(',', $fieldSet[$type]))
+        if(
+            array_key_exists('attributes', $this->resourceRegistrationData)
+            || $this->toAttributes($request, $this->resourceObject) !== null
+        ){
+            $attributes = array_merge(
+                $this->resourceRegistrationData['attributes'] ?? [],
+                $this->toAttributes($request, $this->resourceObject) ?? [],
+            );
+        }else{
+            $keys = $this->only ?? (
+                array_filter(
+                    $this->resourceObject->getFillable(),
+                    fn($key) => !in_array($key, ['identifier', ...($this->except ?? [])])
+                )
+            );
+
+            $attributes = array_filter(
+                $this->resourceObject->getAttributes(),
+                fn($key) => (
+                    !!$this->resourceObject->{$key}
+                    && in_array($key, $keys)
+                ),
+                ARRAY_FILTER_USE_KEY
+            );
+        }
+        $type = $this->getType();
+        if (
+            ($fieldSet = $request->query('fields'))
+            && array_key_exists($type, $fieldSet)
+            && ($fields = explode(',', $fieldSet[$type]))
         ) {
-            return $attributes;
+            $attributes = array_filter($attributes, fn($key) => in_array($key, $fields), ARRAY_FILTER_USE_KEY);
         }
 
-        return array_filter($attributes, fn ($key) => in_array($key, $fields), ARRAY_FILTER_USE_KEY);
+        return array_map(fn ($attribute) => (
+            is_callable($attribute)
+                ? $attribute($request, $this->resourceObject)
+                : $attribute
+        ), $attributes);
+
     }
 
     /**
@@ -332,8 +442,8 @@ private function getAttributes(Request $request)
     public function toRelationshipReferenceArray(): array
     {
         return [
-            'id' => $this->resourceRegistrationData['id'],
-            'type' => $this->resourceRegistrationData['type'],
+            'id' => $this->getId(),
+            'type' => $this->getType(),
         ];
     }
 
diff --git a/tests/Resources/AccountResource.php b/tests/Resources/AccountResource.php
index 18029a3..55b8ff7 100644
--- a/tests/Resources/AccountResource.php
+++ b/tests/Resources/AccountResource.php
@@ -11,21 +11,12 @@ protected function register(): array
     {
 
         $data = [
-            'id' => $this->resourceObject->identifier,
-            'type' => 'accounts',
-            'attributes' => [
-              'name' => $this->resourceObject->name,
-            ],
             'relationships' => [
                 'posts' => ['posts', PostCollectionResource::class],
                 'comments' => ['comments', CommentCollectionResource::class],
             ],
         ];
 
-        if($this->resourceObject->email){
-            $data['attributes']['email']  = $this->resourceObject->email;
-        }
-
         if($this->resourceObject->posts()->count() >= 10){
             $data['meta'] = [
                 'experienced_author' => true,
@@ -35,4 +26,4 @@ protected function register(): array
 
         return $data;
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Resources/CommentResource.php b/tests/Resources/CommentResource.php
index 8bd8dc2..2c75d04 100644
--- a/tests/Resources/CommentResource.php
+++ b/tests/Resources/CommentResource.php
@@ -22,4 +22,4 @@ protected function register(): array
 
         return $data;
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Resources/PostResource.php b/tests/Resources/PostResource.php
index 0b50472..2fa1da4 100644
--- a/tests/Resources/PostResource.php
+++ b/tests/Resources/PostResource.php
@@ -31,4 +31,4 @@ protected function register(): array
 
         return $data;
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Unit/JsonApiResourceTest.php b/tests/Unit/JsonApiResourceTest.php
index 7c53998..21de796 100644
--- a/tests/Unit/JsonApiResourceTest.php
+++ b/tests/Unit/JsonApiResourceTest.php
@@ -70,7 +70,7 @@ public function testRelatedResource()
 
         $response->assertExactJson([
             'data' => $this->createJsonResource($post, [ 'author' => $author]),
-            'included' => [$this->createJsonResource($author)],
+            'included' => [ $this->createJsonResource($author)],
         ]);
     }
 
@@ -262,4 +262,4 @@ public function testResourceIncludedSparseFieldset()
 
 
 
-}
\ No newline at end of file
+}