diff --git a/docs/site/tutorials/todo-list/todo-list-tutorial-controller.md b/docs/site/tutorials/todo-list/todo-list-tutorial-controller.md
index 56c4923aed6c..1a6fc9d5587e 100644
--- a/docs/site/tutorials/todo-list/todo-list-tutorial-controller.md
+++ b/docs/site/tutorials/todo-list/todo-list-tutorial-controller.md
@@ -12,8 +12,9 @@ summary:
 ### Controllers with related models
 
 Defining business logic to handle requests to related models isn't too different
-from handling requests for standalone models. We'll create controllers to handle
-requests for todo-lists and todo items under a todo-list.
+from handling requests for standalone models. We'll create
+[controllers](../../Controllers.md) to handle requests for todo-lists and todo
+items under a todo-list.
 
 ### Create TodoList controller
 
@@ -38,6 +39,9 @@ Controller TodoList will be created in src/controllers/todo-list.controller.ts
 Controller TodoList was created in src/controllers/
 ```
 
+To view the completed file, see the
+[`TodoList` example](https://github.com/strongloop/loopback-next/blob/master/examples/todo-list/src/controllers/todo-list.controller.ts).
+
 And voilà! We now have a set of basic APIs for todo-lists, just like that!
 
 #### Inclusion of Related Models
@@ -128,12 +132,20 @@ async findTodoById(/*...*/) {/*...*/}
 Earlier when we used `lb4 relation` to create the two relations between `Todo`
 and `TodoList`, you may have noticed
 `src/controllers/todo-todo-list.controller.ts` and
-`src/controllers/todo-list-todo.conrtoller.ts` were created. These files contain
+`src/controllers/todo-list-todo.controller.ts` were created. These files contain
 a set of API for the relations.
 
+Relation controllers act in a similar manner to normal controllers, except they
+modify the relational property. For example, in the
+`src/controllers/todo-list-todo.controller.ts` file, we can do requests to the
+endpoint `/todo-lists/{id}/todos`, which we'll see in the
+[Try it out](###Try-it-out) section.
+
 As `src/controllers/todo-todo-list.controller.ts` only contains one method, we
 can move it to the `Todo` controller and delete that file:
 
+{% include code-caption.html content="src/models/todo.controller.ts" %}
+
 ```ts
 export class TodoController {
   constructor() // ...
diff --git a/docs/site/tutorials/todo-list/todo-list-tutorial-has-one-relation.md b/docs/site/tutorials/todo-list/todo-list-tutorial-has-one-relation.md
index 0aa5f34df428..664ac104ba6f 100644
--- a/docs/site/tutorials/todo-list/todo-list-tutorial-has-one-relation.md
+++ b/docs/site/tutorials/todo-list/todo-list-tutorial-has-one-relation.md
@@ -69,7 +69,12 @@ Repository TodoListImageRepository was created in src/repositories/
 
 ### Add the Relation
 
-First, let's add the relation to the model classes:
+{% include note.html content="
+We are working on adding `hasOne` to the CLI command `lb4 relation`. See [issue #2980](https://github.com/strongloop/loopback-next/issues/2980).
+" %}
+
+Adding a [`hasOne` relation](../../hasOne-relation.md) is simple. First, let's
+add the relation to the model classes:
 
 {% include code-caption.html content="src/models/todo-list-image.model.ts" %}
 
@@ -197,7 +202,9 @@ export class TodoListImageRepository extends DefaultCrudRepository<
 ```
 
 {% include note.html content="
-We are working on adding `hasOne` to the CLI command `lb4 relation`. See [issue #2980](https://github.com/strongloop/loopback-next/issues/2980).
+We use **default** foreign key and source property names in this case.
+If you'd like to customize them, please check [`Relation Metadata`](
+../../hasOne-relation.md#relation-metadata).
 " %}
 
 ### Create the Controller
diff --git a/docs/site/tutorials/todo-list/todo-list-tutorial-model.md b/docs/site/tutorials/todo-list/todo-list-tutorial-model.md
index a2a709920d26..1803bc12610f 100644
--- a/docs/site/tutorials/todo-list/todo-list-tutorial-model.md
+++ b/docs/site/tutorials/todo-list/todo-list-tutorial-model.md
@@ -69,6 +69,9 @@ Enter an empty property name when done
 Model TodoList was created in src/models/
 ```
 
+To view the completed file, see the
+[`TodoList` example](https://github.com/strongloop/loopback-next/blob/master/examples/todo-list/src/models/todo-list.model.ts).
+
 Once the models have been completely configured, it's time to move on to adding
 a [repository](todo-list-tutorial-repository.md) for `TodoList`.
 
diff --git a/docs/site/tutorials/todo-list/todo-list-tutorial-repository.md b/docs/site/tutorials/todo-list/todo-list-tutorial-repository.md
index d0bb0b633435..45a114ef7202 100644
--- a/docs/site/tutorials/todo-list/todo-list-tutorial-repository.md
+++ b/docs/site/tutorials/todo-list/todo-list-tutorial-repository.md
@@ -40,7 +40,8 @@ Repository TodoListRepository was created in src/repositories/
 #### Custom Methods
 
 A custom method can be added to the repository class. For example, if we want to
-get a `title` from the repository level, the following method can be added:
+find a `TodoList` with a specific `title` from the repository level, the
+following method can be added:
 
 ```ts
 export class TodoListRepository extends DefaultCrudRepository<
@@ -57,6 +58,9 @@ export class TodoListRepository extends DefaultCrudRepository<
 }
 ```
 
+To view the completed file, see the
+[`TodoList` example](https://github.com/strongloop/loopback-next/blob/master/examples/todo-list/src/repositories/todo-list.repository.ts).
+
 ### Navigation
 
 Previous step: [Add TodoList model](todo-list-tutorial-model.md)
diff --git a/docs/site/tutorials/todo/todo-tutorial-controller.md b/docs/site/tutorials/todo/todo-tutorial-controller.md
index f3c17b6585f9..67706524430b 100644
--- a/docs/site/tutorials/todo/todo-tutorial-controller.md
+++ b/docs/site/tutorials/todo/todo-tutorial-controller.md
@@ -9,10 +9,10 @@ summary: LoopBack 4 Todo Application Tutorial - Add a Controller
 
 ### Controllers
 
-In LoopBack 4, controllers handle the request-response lifecycle for your API.
-Each function on a controller can be addressed individually to handle an
-incoming request (like a POST request to `/todos`), to perform business logic,
-and to return a response.
+In LoopBack 4, [controllers](../../Controllers.md) handle the request-response
+lifecycle for your API. Each function on a controller can be addressed
+individually to handle an incoming request (like a POST request to `/todos`), to
+perform business logic, and to return a response.
 
 `Controller` is a class that implements operations defined by application's API.
 It implements an application's business logic and acts as a bridge between the
@@ -76,6 +76,9 @@ Some additional things to note about this example:
   specifying the type of certain value primitives, such as
   `@param.path.number('id')`.
 
+To view the completed file, see the
+[`Todo` example](https://github.com/strongloop/loopback-next/blob/master/examples/todo/src/controllers/todo.controller.ts).
+
 Now that we've wired up the controller, our last step is to tie it all into the
 [Application](todo-tutorial-putting-it-together.md)!
 
diff --git a/docs/site/tutorials/todo/todo-tutorial-datasource.md b/docs/site/tutorials/todo/todo-tutorial-datasource.md
index fa5a70172225..7f0c63681750 100644
--- a/docs/site/tutorials/todo/todo-tutorial-datasource.md
+++ b/docs/site/tutorials/todo/todo-tutorial-datasource.md
@@ -21,7 +21,7 @@ the application. Typically, in LoopBack 4, datasources are used in conjunction
 with [Repositories](../../Repositories.md) to provide access to data.
 
 For more information about datasources in LoopBack, see
-[DataSources](https://loopback.io/doc/en/lb4/DataSources.html).
+[DataSources](../../DataSources.md).
 
 Since our Todo API will need to persist instances of Todo items, we'll need to
 create a datasource definition to make this possible.
@@ -46,6 +46,9 @@ lb4 datasource
 Datasource Db was created in src/datasources/
 ```
 
+To view the completed files, see the
+[`Todo` example](https://github.com/strongloop/loopback-next/tree/master/examples/todo/src/datasources).
+
 Create a `data` folder in the applications root and add a new file called
 `db.json` containing an example database.
 
diff --git a/docs/site/tutorials/todo/todo-tutorial-geocoding-service.md b/docs/site/tutorials/todo/todo-tutorial-geocoding-service.md
index 7d16952c213f..a139147ebbdf 100644
--- a/docs/site/tutorials/todo/todo-tutorial-geocoding-service.md
+++ b/docs/site/tutorials/todo/todo-tutorial-geocoding-service.md
@@ -11,9 +11,10 @@ summary:
 ### Services
 
 To call other APIs and web services from LoopBack applications, we recommend to
-use Service Proxies as a design pattern for encapsulating low-level
-implementation details of communication with 3rd-party services and providing
-JavaScript/TypeScript API that's easy to consume e.g. from Controllers. See
+use [Service Proxies](../../Services.md) as a design pattern for encapsulating
+low-level implementation details of communication with 3rd-party services and
+providing JavaScript/TypeScript API that's easy to consume e.g. from
+Controllers. See
 [Calling other APIs and web services](../../Calling-other-APIs-and-Web-Services.md)
 for more details.
 
@@ -93,13 +94,13 @@ docs here: [REST connector](/doc/en/lb3/REST-connector.html).
 
 ### Implement a service provider
 
-Use the `lb4 service` command and the following inputs to create a calculator
+Use the `lb4 service` command and the following inputs to create a geocoder
 service:
 
 ```sh
 lb4 service
 ? Service type: Remote service proxy backed by a data source
-? Please select the datasource GeocoderDataSource
+? Please select the datasource GeocoderDatasource
 ? Service name: geocoder
    create src/services/geocoder.service.ts
    update src/services/index.ts
diff --git a/docs/site/tutorials/todo/todo-tutorial-model.md b/docs/site/tutorials/todo/todo-tutorial-model.md
index 45a78145f1ee..76a4c4db4435 100644
--- a/docs/site/tutorials/todo/todo-tutorial-model.md
+++ b/docs/site/tutorials/todo/todo-tutorial-model.md
@@ -22,7 +22,7 @@ name, type, and other constraints.
 Models are used for data exchange on the wire or between different systems.
 
 For more information about Models and how they are used in LoopBack, see
-[Models](https://loopback.io/doc/en/lb4/Model.html).
+[Models](../../Model.md).
 
 {% include note.html content="LoopBack 3 treated models as the 'center' of operations; in LoopBack 4, that is no longer the case. While LoopBack 4 provides many of the helper methods and decorators that allow you to utilize models in a similar way, you are no longer _required_ to do so!
 " %}
@@ -97,6 +97,9 @@ Enter an empty property name when done
 Model Todo was created in src/models/
 ```
 
+To view the completed file, see the
+[`Todo` example](https://github.com/strongloop/loopback-next/blob/master/examples/todo/src/models/todo.model.ts).
+
 Now that we have our model, it's time to add a
 [datasource](todo-tutorial-datasource.md) so we can perform real CRUD
 operations!
diff --git a/docs/site/tutorials/todo/todo-tutorial-repository.md b/docs/site/tutorials/todo/todo-tutorial-repository.md
index 77bf8e376555..9e54fe02426d 100644
--- a/docs/site/tutorials/todo/todo-tutorial-repository.md
+++ b/docs/site/tutorials/todo/todo-tutorial-repository.md
@@ -20,7 +20,7 @@ strong-typed data access (for example, CRUD) operations of a domain model
 against the underlying database or service.
 
 For more information about Repositories, see
-[Repositories](https://loopback.io/doc/en/lb4/Repositories.html).
+[Repositories](../../Repositories.md).
 
 ### Create your repository
 
@@ -51,6 +51,9 @@ model definition and 'db' datasource configuration and retrieves the datasource
 using
 [Dependency Injection](https://loopback.io/doc/en/lb4/Dependency-injection.html).
 
+To view the completed file, see the
+[`Todo` example](https://github.com/strongloop/loopback-next/blob/master/examples/todo/src/repositories/todo.repository.ts).
+
 Now we can expose the `Todo` API through the
 [controller](todo-tutorial-controller.md).