fix: improve docs

Author: Nemikolh

docs/tutorialkit.dev/src/content/docs/guides/creating-content.mdx

@@ -110,10 +110,37 @@ template: my-advanced-template
 
 This declaration will make TutorialKit use the `src/templates/my-advanced-template` directory as the base for the lesson.
 
-If you start having a lot of templates and they all share some code, you can create a shared template that they all extend. This way, you can keep the shared code in one place and avoid duplication. To do that, you need to specify the `extends` property in the template's `.tk-config.json` file:
+If you start having a lot of templates and they all share some files, you can create a shared template that they all extend. This way, you can keep the shared files in one place and avoid duplication. To do that, you need to specify the `extends` property in the template's `.tk-config.json` file:
 
 ```json
 {
   "extends": "../shared-template"
 }
 ```
+
+This will make the template inherit all files from the `shared-template` directory. You can then override any file in the template by placing a file with the same name in the template's directory.
+Here's an example of how you can structure your templates:
+
+```
+src/templates
+├── shared-template
+│   ├── index.js
+│   ├── index.html
+│   └── package.json
+│
+└── first-template
+│   │   # Contains { "extends": "../shared-template" }
+│   │   # Inherits all files from "shared-template"
+│   ├── .tk-config.json
+│   │
+│   │   # Only available in first-template
+│   └── main.js
+│
+└── second-template
+    │   # Contains { "extends": "../shared-template" }
+    │   # Inherits all files from "shared-template"
+    ├── .tk-config.json
+    │
+    │   # Overrides "index.js" from "shared-template"
+    └── index.js
+```