diff --git a/adev/src/content/tutorials/first-app/steps/01-hello-world/README.md b/adev/src/content/tutorials/first-app/steps/01-hello-world/README.md
index 9c45f96dc35..8baa929d579 100644
--- a/adev/src/content/tutorials/first-app/steps/01-hello-world/README.md
+++ b/adev/src/content/tutorials/first-app/steps/01-hello-world/README.md
@@ -100,7 +100,7 @@ In your IDE:
 
 1. In `app.ts`, in the `App` class definition, replace the `title` line with this code to change the component title.
 
-   <docs-code header="Replace in src/app/app.ts" path="adev/src/content/tutorials/first-app/steps/02-Home/src/app/app.ts" visibleLines="[11,13]"/>
+   <docs-code header="Replace in src/app/app.ts" path="adev/src/content/tutorials/first-app/steps/02-Home/src/app/app.ts" visibleLines="[10]"/>
 
    Then, save the changes you made to `app.ts`.
 
diff --git a/adev/src/content/tutorials/first-app/steps/05-inputs/README.md b/adev/src/content/tutorials/first-app/steps/05-inputs/README.md
index df1d40976aa..d1636b6d3e5 100644
--- a/adev/src/content/tutorials/first-app/steps/05-inputs/README.md
+++ b/adev/src/content/tutorials/first-app/steps/05-inputs/README.md
@@ -30,7 +30,7 @@ In the code editor, import the `input` helper method from `@angular/core` into t
 <docs-step title="Add the Input property">
 Add a required property called `housingLocation` and initialize it using `input.required()` with the type `HousingLocationInfo`.
 
-  <docs-code header="Declare the input property in housing-location.ts" path="adev/src/content/tutorials/first-app/steps/06-property-binding/src/app/housing-location/housing-location.ts" visibleLines="[12]"/>
+  <docs-code header="Declare the input property in housing-location.ts" path="adev/src/content/tutorials/first-app/steps/06-property-binding/src/app/housing-location/housing-location.ts" visibleLines="[10]"/>
 
 You have to invoke the `required` method on `input` to indicate that the parent component must provide a value. In our example application, we know this value will always be passed in — this is by design. The `.required()` call ensures that the TypeScript compiler enforces this and treats the property as non-nullable when this component is used in a template.
 
diff --git a/adev/src/content/tutorials/first-app/steps/09-services/README.md b/adev/src/content/tutorials/first-app/steps/09-services/README.md
index ecc0742137d..46b3fdf0d63 100644
--- a/adev/src/content/tutorials/first-app/steps/09-services/README.md
+++ b/adev/src/content/tutorials/first-app/steps/09-services/README.md
@@ -57,7 +57,7 @@ In the **Edit** pane of your IDE:
    1. Inside the `HousingService` class, paste these functions after the data you just copied.
       These functions allow dependencies to access the service's data.
 
-      <docs-code header="Service functions in src/app/housing.service.ts" path="adev/src/content/tutorials/first-app/steps/10-routing/src/app/housing.service.ts" visibleLines="[112,118]"/>
+      <docs-code header="Service functions in src/app/housing.service.ts" path="adev/src/content/tutorials/first-app/steps/10-routing/src/app/housing.service.ts" visibleLines="[110,116]"/>
 
       You will need these functions in a future lesson. For now, it is enough to understand that these functions return either a specific `HousingLocation` by id or the entire list.
 
diff --git a/adev/src/content/tutorials/first-app/steps/10-routing/README.md b/adev/src/content/tutorials/first-app/steps/10-routing/README.md
index 726eb9781e3..db18b91ed28 100644
--- a/adev/src/content/tutorials/first-app/steps/10-routing/README.md
+++ b/adev/src/content/tutorials/first-app/steps/10-routing/README.md
@@ -37,11 +37,11 @@ In this lesson, you will enable routing in your application to navigate to the d
 2.  In `main.ts`, make the following updates to enable routing in the application:
     1.  Import the routes file and the `provideRouter` function:
 
-          <docs-code header="Import routing details in src/main.ts" path="adev/src/content/tutorials/first-app/steps/11-details-page/src/main.ts" visibleLines="[7,8]"/>
+          <docs-code header="Import routing details in src/main.ts" path="adev/src/content/tutorials/first-app/steps/11-details-page/src/main.ts" visibleLines="[3,4]"/>
 
     1.  Update the call to `bootstrapApplication` to include the routing configuration:
 
-          <docs-code header="Add router configuration in src/main.ts" path="adev/src/content/tutorials/first-app/steps/11-details-page/src/main.ts" visibleLines="[10,17]"/>
+          <docs-code header="Add router configuration in src/main.ts" path="adev/src/content/tutorials/first-app/steps/11-details-page/src/main.ts" visibleLines="[6,8]"/>
 
 3.  In `src/app/app.ts`, update the component to use routing:
     1.  Add file level imports for the router directives `RouterOutlet` and `RouterLink`:
diff --git a/adev/src/content/tutorials/first-app/steps/12-forms/README.md b/adev/src/content/tutorials/first-app/steps/12-forms/README.md
index e6f26e5573a..fe1ed0e4d6d 100644
--- a/adev/src/content/tutorials/first-app/steps/12-forms/README.md
+++ b/adev/src/content/tutorials/first-app/steps/12-forms/README.md
@@ -25,7 +25,7 @@ In the **Edit** pane of your IDE:
 
 1.  In `src/app/housing.service.ts`, inside the `HousingService` class, paste this method at the bottom of the class definition.
 
-       <docs-code header="Submit method in src/app/housing.service.ts" path="adev/src/content/tutorials/first-app/steps/13-search/src/app/housing.service.ts" visibleLines="[120,124]"/>
+       <docs-code header="Submit method in src/app/housing.service.ts" path="adev/src/content/tutorials/first-app/steps/13-search/src/app/housing.service.ts" visibleLines="[118,122]"/>
 
 1.  Confirm that the app builds without error.
     Correct any errors before you continue to the next step.
diff --git a/adev/src/content/tutorials/first-app/steps/14-http/README.md b/adev/src/content/tutorials/first-app/steps/14-http/README.md
index 05b510549d4..ef2c518f715 100644
--- a/adev/src/content/tutorials/first-app/steps/14-http/README.md
+++ b/adev/src/content/tutorials/first-app/steps/14-http/README.md
@@ -156,13 +156,13 @@ The data source has been configured, the next step is to update your web app to
 
 1.  Add a string property called `url` and set its value to `'http://localhost:3000/locations'`
 
-    <docs-code header="Add url property to housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[8]"/>
+    <docs-code header="Add url property to housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[6]"/>
 
     This code will result in errors in the rest of the file because it depends on the `housingLocationList` property. We're going to update the service methods next.
 
 1.  Update the `getAllHousingLocations` function to make a call to the web server you configured.
 
-     <docs-code header="Update the getAllHousingLocations method in housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[10,13]"/>
+     <docs-code header="Update the getAllHousingLocations method in housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[8,11]"/>
 
     The code now uses asynchronous code to make a **GET** request over HTTP.
 
@@ -172,7 +172,7 @@ The data source has been configured, the next step is to update your web app to
 
     HELPFUL: Notice the `fetch` method has been updated to _query_ the data for location with a matching `id` property value. See [URL Search Parameter](https://developer.mozilla.org/en-US/docs/Web/API/URL/search) for more information.
 
-     <docs-code header="Update the getHousingLocationById method in housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[15,19]"/>
+     <docs-code header="Update the getHousingLocationById method in housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[13,17]"/>
 
 1.  Once all the updates are complete, your updated service should match the following code.