Problems with login and authentication in Laravel - authentication

Question

I need help with my login and authentication of admin.
In the database I have a table called 'admins' with columns of 'name', 'surname', 'password' in my native language.
Every time I press the login button when I try to log in, I get an error:
"Undefined index: password"
where password is in English in folder:
C:\wamp\www\app\vendor\laravel\framework\src\Illuminate\Auth\EloquentUserProvider.php
and I don't know why.
My custom controller AuthController:
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Hash;
use Session;
use App\Models\Admin;
use Illuminate\Support\Facades\Auth;
class AuthController extends Controller
{
public function index()
{
return view('auth.login');
}
public function customLogin(Request $request)
{
$request->validate([
'name' => 'required',
'surname' => 'required',
'passw' => 'required',
]);
$credentials = $request->only('name', 'surname', 'passw');
if (Auth::attempt($credentials)) {
return redirect()->intended('');
}
return redirect("login")->withSuccess('Wrong input data.');
}
public function dashboard()
{
if(Auth::check()){
return view('');
}
return redirect("login")->withSuccess('Wrong input data.');
}
public function signOut() {
Session::flush();
Auth::logout();
return Redirect('');
}
}
My route:
Auth::routes();
Route::post('/login', 'AuthController#customLogin');
I consulted with an acquaintance that specialises in web-programming and she said I should do a custom AuthController, which I did, but the problem is either still not fixed or this is a different error.
And from web sources I used:
https://www.positronx.io/laravel-custom-authentication-login-and-registration-tutorial/