My solution

app/Http/Controllers/BuildingController.php

@@ -17,7 +17,7 @@ public function create()
     // TASK: Customize the validation error message to say "Please enter the name"
     public function store(StoreBuildingRequest $request)
     {
-        Building::create($validator->validated());
+        Building::create($request->validated());
 
         return 'Success';
     }

app/Http/Controllers/ItemController.php

@@ -7,9 +7,6 @@
 
 class ItemController extends Controller
 {
-    // TASK: generate that StoreItemRequest class
-    //   with authorization returning TRUE
-    //   and validation rules: name is required, and description is required
     public function store(StoreItemRequest $request)
     {
         Item::create($request->validated());

app/Http/Controllers/PostController.php

@@ -9,10 +9,9 @@ class PostController extends Controller
 {
     public function store(Request $request)
     {
-        $request->validate(
-            // ... TASK: write validation here so that "title" field
-            //           would be required and unique in the "posts" DB table
-        );
+        $request->validate([
+            'title' => 'required|unique:posts'
+        ]);
 
         // Saving the post
         Post::create(['title' => $request->title]);

app/Http/Controllers/ProfileController.php

@@ -13,6 +13,8 @@ public function update(Request $request)
             // <input name="profile[name]" ... />
             // <input name="profile[email]" ... />
             // Write validation rules, so both name and email are required
+            'profile.name' => 'required',
+            'profile.email' => 'required'
         ]);
 
         auth()->user()->update($request->profile ?? []);

app/Http/Controllers/UserController.php

@@ -9,9 +9,10 @@ class UserController extends Controller
 {
     public function update(User $user, UpdateUserRequest $request)
     {
+        // dd($request->all());
         // TASK: change this line to not allow is_admin field to be updated
         // Update only the fields that are validated in UpdateUserRequest
-        $user->update($request->all());
+        $user->update($request->validated());
 
         return 'Success';
     }

app/Http/Requests/StoreBuildingRequest.php

@@ -30,4 +30,10 @@ public function rules()
             'name' => 'required'
         ];
     }
+    public function messages()
+    {
+        return [
+            'name.required' => 'Please enter the name'
+        ];
+    }
 }

app/Http/Requests/StoreItemRequest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreItemRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'name' => 'required',
+            'description' => 'required'
+        ];
+    }
+}

app/Rules/Uppercase.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class Uppercase implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (ucfirst($value) !== $value) {
+            $fail('The :attribute does not start with an uppercased letter');
+        }
+    }
+}

resources/views/products/create.blade.php

@@ -4,6 +4,12 @@
     <br />
     <input type="text" name="name" />
     <br />
+
+    @error('name')
+        <div>
+            <p>{{ $message }}</p>
+        </div>
+    @enderror
     {{-- TASK: show the validation error for the specific "name" field --}}
     {{-- using one Blade directive: pseudo-code below --}}
     {{-- @directive --}}

resources/views/projects/create.blade.php

@@ -3,7 +3,16 @@
 {{-- TASK: add the validation errors here - with whatever HTML structure you want --}}
 {{-- in case of title/description empty, visitor should see --}}
 {{-- "The name field is required." and "The description field is required." --}}
-
+@if ($errors->any){
+    <ul>
+        @foreach ($errors->all() as $error)
+            <li>
+                {{ $error }}
+            </li>
+        @endforeach
+    </ul>
+    }
+@endif
 <form method="POST" action="{{ route('projects.store') }}">
     @csrf
     Title:

resources/views/teams/create.blade.php

@@ -3,7 +3,7 @@
     Name:
     <br />
     {{-- TASK: change this field so it would contain old value after validation error --}}
-    <input type="text" name="name" />
+    <input type="text" name="name" value="{{ old('name') }}" />
     <br /><br />
     <button type="submit">Save</button>
 </form>