diff --git a/README.md b/README.md
index 79a79c0..d1b889f 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ composer require php-di/php-di
 In this step, we are adding the WPify Scoper to the plugin, so that the dependencies are not conflicting with other
 plugins.
 
-links: [WPify Scoper](https://packagist.org/packages/wpify/scoper)
+Links: [WPify Scoper](https://packagist.org/packages/wpify/scoper)
 
 ```bash
 composer require wpify/scoper
@@ -47,7 +47,14 @@ composer require wpify/scoper
 In this step, we are adding the WPify Custom Fields to the plugin, so that we can easily create custom fields for our
 plugin. Custom fields are required in composer-deps.json file.
 
-links: [WPify Custom Fields](https://packagist.org/packages/wpify/custom-fields)
+Links: [WPify Custom Fields](https://packagist.org/packages/wpify/custom-fields)
 
+### 04 - WPify Model
 
-[Next step >>>](https://github.com/wpify/plugin-tutorial/tree/04-models)
+We have a custom post type, taxonomy, but we have no easy way how to access data. In this step, we are adding 
+WPify Models, so we can access data easily and use them wherever we need.
+
+Links: [WPify Model](https://packagist.org/packages/wpify/model)
+
+
+[Next step >>>](https://github.com/wpify/plugin-tutorial/tree/05-templates)
diff --git a/bootstrap.php b/bootstrap.php
index 26ec16e..54c9bbc 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -18,6 +18,9 @@
 use WpifyPluginTutorialDeps\DI\DependencyException;
 use WpifyPluginTutorialDeps\DI\NotFoundException;
 use WpifyPluginTutorial\Plugin;
+use WpifyPluginTutorialDeps\Wpify\Model\Manager;
+
+use function WpifyPluginTutorialDeps\DI\create;
 
 require 'deps/scoper-autoload.php';
 require 'deps/autoload.php';
@@ -35,7 +38,9 @@ function wpifypt_container(): Container {
 
 	if ( empty( $container ) ) {
 		$containerBuilder = new ContainerBuilder();
-		$containerBuilder->addDefinitions( array() );
+		$containerBuilder->addDefinitions( array(
+			Manager::class => create()->constructor( array() )
+		) );
 		$container = $containerBuilder->build();
 	}
 
@@ -90,8 +95,10 @@ function wpifypt_uninstall(): void {
 	wpifypt()->uninstall();
 }
 
+/**
+ * Hook basic stuff, so the plugin can work.
+ */
 add_action( 'plugins_loaded', 'wpifypt' );
-
 register_activation_hook( __FILE__, 'wpifypt_activate' );
 register_deactivation_hook( __FILE__, 'wpifypt_deactivate' );
 register_uninstall_hook( __FILE__, 'wpifypt_uninstall' );
diff --git a/composer-deps.json b/composer-deps.json
index baa6210..e1bcfd7 100644
--- a/composer-deps.json
+++ b/composer-deps.json
@@ -2,6 +2,7 @@
     "require": {
         "php": "^8.0",
         "php-di/php-di": "^7.0",
-        "wpify/custom-fields": "^3.9"
+        "wpify/custom-fields": "^3.9",
+        "wpify/model": "^4.0"
     }
 }
diff --git a/src/Blocks/BookLinkBlock.php b/src/Blocks/BookLinkBlock.php
index 5fcb29f..3f6af9c 100644
--- a/src/Blocks/BookLinkBlock.php
+++ b/src/Blocks/BookLinkBlock.php
@@ -3,19 +3,23 @@
 namespace WpifyPluginTutorial\Blocks;
 
 use WpifyPluginTutorial\Managers\BlocksManager;
+use WpifyPluginTutorial\Repositories\BookRepository;
 use WpifyPluginTutorialDeps\Wpify\CustomFields\CustomFields;
 
 class BookLinkBlock {
 	const KEY = 'wpify/book-link';
 
-	public function __construct( CustomFields $custom_fields ) {
+	public function __construct(
+		CustomFields $custom_fields,
+		private BookRepository $book_repository,
+	) {
 		$custom_fields->create_gutenberg_block( array(
 			'name'            => self::KEY,
 			'title'           => __( 'Book link', 'wpifypt' ),
 			'category'        => BlocksManager::BOOKS_KEY,
 			'icon'            => 'book',
 			'supports'        => array( 'anchor' => true ),
-			'example'         => array( 'book_id' => 1 ),
+			'example'         => array( 'book_id' => 1, 'title' => 'Example book' ),
 			'render_callback' => array( $this, 'render' ),
 			'items'           => array(
 				array(
@@ -34,6 +38,14 @@ public function __construct( CustomFields $custom_fields ) {
 	}
 
 	public function render( $block_attributes, $content ) {
-		return '<h1>Book: ' . $block_attributes['book_id'] . '</h1>';
+		// Get the book from the repository.
+		$book = $this->book_repository->get( $block_attributes['book_id'] );
+
+		// Set the attributes needed for the render.
+		$block_attributes['title'] = $book->title;
+		$block_attributes['isbn']  = $book->isbn;
+
+		// return the string with the rendered block.
+		return '<h1 id="' . $block_attributes['anchor'] . '">Book: ' . $block_attributes['title'] . ' (' . $block_attributes['isbn'] . ')</h1>';
 	}
 }
diff --git a/src/Managers/RepositoriesManager.php b/src/Managers/RepositoriesManager.php
new file mode 100644
index 0000000..ca0a138
--- /dev/null
+++ b/src/Managers/RepositoriesManager.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace WpifyPluginTutorial\Managers;
+
+use WpifyPluginTutorial\Repositories\BookAuthorRepository;
+use WpifyPluginTutorial\Repositories\BookRepository;
+use WpifyPluginTutorialDeps\DI\Container;
+use WpifyPluginTutorialDeps\Wpify\Model\Manager;
+
+class RepositoriesManager {
+	public function __construct(
+		Manager $manager,
+		Container $container,
+		BookRepository $book_repository,
+		BookAuthorRepository $book_author_repository,
+	) {
+		// This registers all build-in repositories in WPify Models to our DI container,
+		// so we can use them in our plugin as constructor dependency.
+		foreach ( $manager->get_repositories() as $repository ) {
+			$container->set( $repository::class, $repository );
+		}
+
+		// Register all custom repositorues in WPify Models, so it knows how to use them.
+		$manager->register_repository( $book_repository );
+		$manager->register_repository( $book_author_repository );
+	}
+}
diff --git a/src/Models/BookAuthorModel.php b/src/Models/BookAuthorModel.php
new file mode 100644
index 0000000..5dae642
--- /dev/null
+++ b/src/Models/BookAuthorModel.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace WpifyPluginTutorial\Models;
+
+use WpifyPluginTutorialDeps\Wpify\Model\Attributes\Meta;
+use WpifyPluginTutorialDeps\Wpify\Model\Term;
+
+class BookAuthorModel extends Term {
+	#[Meta]
+	public string $date_of_birth = '';
+
+	#[Meta]
+	public string $date_of_death = '';
+}
diff --git a/src/Models/BookModel.php b/src/Models/BookModel.php
new file mode 100644
index 0000000..46ff0cd
--- /dev/null
+++ b/src/Models/BookModel.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace WpifyPluginTutorial\Models;
+
+use WpifyPluginTutorialDeps\Wpify\Model\Attributes\Meta;
+use WpifyPluginTutorialDeps\Wpify\Model\Post;
+
+class BookModel extends Post {
+	#[Meta]
+	public string $isbn = '';
+
+	#[Meta]
+	public string $first_published = '';
+}
diff --git a/src/Plugin.php b/src/Plugin.php
index a386cdd..53f2e36 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -4,6 +4,7 @@
 
 use WpifyPluginTutorial\Managers\BlocksManager;
 use WpifyPluginTutorial\Managers\PostTypesManager;
+use WpifyPluginTutorial\Managers\RepositoriesManager;
 use WpifyPluginTutorial\Managers\TaxonomiesManager;
 
 /**
@@ -18,6 +19,7 @@ public function __construct(
 		PostTypesManager $post_types_manager,
 		TaxonomiesManager $taxonomies_manager,
 		BlocksManager $blocks_manager,
+		RepositoriesManager $repositories_manager,
 	) {
 		// stuff to do on plugin load
 	}
diff --git a/src/Repositories/BookAuthorRepository.php b/src/Repositories/BookAuthorRepository.php
new file mode 100644
index 0000000..46f585a
--- /dev/null
+++ b/src/Repositories/BookAuthorRepository.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace WpifyPluginTutorial\Repositories;
+
+use WpifyPluginTutorial\Models\BookAuthorModel;
+use WpifyPluginTutorial\Taxonomies\BookAuthorTaxonomy;
+use WpifyPluginTutorialDeps\Wpify\Model\TermRepository;
+
+class BookAuthorRepository extends TermRepository {
+	public function model(): string {
+		return BookAuthorModel::class;
+	}
+
+	public function taxonomy(): string {
+		return BookAuthorTaxonomy::KEY;
+	}
+}
diff --git a/src/Repositories/BookRepository.php b/src/Repositories/BookRepository.php
new file mode 100644
index 0000000..9cdf918
--- /dev/null
+++ b/src/Repositories/BookRepository.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace WpifyPluginTutorial\Repositories;
+
+use WpifyPluginTutorial\Models\BookModel;
+use WpifyPluginTutorial\PostTypes\BookPostType;
+use WpifyPluginTutorialDeps\Wpify\Model\PostRepository;
+
+class BookRepository extends PostRepository {
+	public function model(): string {
+		return BookModel::class;
+	}
+
+	public function post_types(): array {
+		return array( BookPostType::KEY );
+	}
+}