Replace stub page with new hints (#34799)

* Replace stub page

* Update index.md

guide/english/certifications/apis-and-microservices/mongodb-and-mongoose/create-a-model/index.md

@@ -1,24 +1,41 @@
 ---
 title: Create a Model
 ---
-## Create a Model
 
-### Creating Schema
+There are 3 things to do in this challenge. You can click each item to see the code.
+
+<details>
+  <summary>Assign Mongoose Schema to a variable. This is not necessary but will make your code easier to read.</summary>
+
+```javascript
+const Schema = mongoose.Schema;
+```
+</details>
+
 See the [Mongoose docs](https://mongoosejs.com/docs/guide.html) first where is a lot of useful stuff. 
 When you are building schema you can use either of three options for name validation
-```javascript
+```js
 name: String
 name: {type: String}
 name: {type: String, required: true} //preferred
 ```
-For array of favoriteFoods here is the validation:
-```javascript
-favoriteFoods: [{ type: String }]
-```
-### Creating a Model
-Now that we have the schema of our model, we can actually create a model by:
-```javascript
-var Model  = mongoose.model('Model', modelSchema);
-```
 
-<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+<details>
+  <summary>Create Person schema.</summary>
+
+```javascript
+const personSchema = new Schema({
+  name: { type: String, required: true },
+  age: Number,
+  favoriteFoods:   [String]
+});
+```
+**Note**: If you choose to skip the first step, you have to use `mongoose.Schema` instead of `Schema`.
+</details>
+<details>
+  <summary>Create Person model from the schema.</summary>
+
+```javascript
+const Person = mongoose.model('Person', personSchema);
+```
+</details>