Laravel problems to redirect after authenticating?

Question

I’m starting to learn how to use the Framework Laravel and I’m having a problem with directing after login, I’m using the login system itself Framework.

To learn how to use the Framework I’m creating a simple blog and it’s time to log in /admin even if I change the attribute protected $redirectTo = '/dashboard';

I wonder what it could be because I couldn’t find the bug?

As requested by friends below, follow the route code and class where I changed the redirectTo attribute.

Routes/web.php

<?php
    Route::get('/', function () {
        return view('welcome');
    });

    Auth::routes();
    Route::get('/admin', 'HomeController@index');

    Route::group(['prefix' => 'dashboard'], function() {
        Route::get('/','DashboardController@index');
    });

app Http Controllers Auth Logincontroller.php

<?php

    namespace App\Http\Controllers\Auth;

    use App\Http\Controllers\Controller;
    use Illuminate\Foundation\Auth\AuthenticatesUsers;

    class LoginController extends Controller{

    use AuthenticatesUsers;

    /**
    * Where to redirect users after login.
    *
    * @var string
    */
    protected $redirectTo = '/dashboard';

    /**
    * Create a new controller instance.
    *
    * @return void
    */
    public function __construct(){
        $this->middleware('guest', ['except' => 'logout']);
    }

App/Http/Controllers/Homecontroller

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class HomeController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('auth');
    }

    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        return view('home');
    }
}