how to define auth guard in laravel code example

Example 1: laravel make auth

Laravel's laravel/ui package provides a quick way to scaffold all of the routes and views you need for authentication using a few simple commands:

composer require laravel/ui

php artisan ui vue --auth

Example 2: laravel check auth

use Illuminate\Support\Facades\Auth;

if (Auth::check()) {
    // The user is logged in...
}

Example 3: laravel auth

//laravel 8.x
//for bootstrap scafolding
php artisan ui bootstrap --auth

Example 4: laravel setup auth

// Laravel 5.x
php artisan make:auth