In this tutorial im going to fix target class does not exist. Why its comes Target class does not exists — Its means in Route/web.php file you are not imported your controller name. first you have to import your controller name in web.php file. As define below.

1 step go to your controller file and check your controller name

<?phpnamespace App\Http\Controllers;use App\Http\Controllers\Controller;use Illuminate\Http\Request;class ContactController extends Controller{    public function index(){        return view('contact');    }}

2nd Step go to Route/web.php file and import your controller file name.

<?phpuse Illuminate\Support\Facades\Route;use App\Http\Controllers\ContactController;/*|--------------------------------------------------------------------------| Web Routes|--------------------------------------------------------------------------|| Here is where you can register web routes for your application. These| routes are loaded by the RouteServiceProvider within a group which| contains the "web" middleware group. Now create something great!|*/Route::get('/', function () {    return view('welcome');});Route::get('/about',function(){    return view('about');});Route::get('contact', [ContactController::class, 'index']);

Now run this command in your terminal

php artisan serve

Now project run successfully.