Answers for "class 'app auth' not found"

Class "App\Http\Controllers\Auth" not found

use Illuminate\Support\Facades\Auth;

Class "\App\User" not found

Go to config/auth.php and change this file
'providers' => [
        'users' => [
            'driver' => 'eloquent',
            'model' => App\Models\User::class,
        ],
    ]