$ composer require laravel/ui
 
$ php artisan ui:auth
 
$ php artisan migrate
 
$ php artisan serve


 Step 4: If you had seen your Login and Register FORM it would be without any CSS or Bootstrap design guys so, to solve that you have to add or install Bootstrap in our laravel 8 application guys as shown below:

Open file: resources/views/layouts/app.blade.php file.

add the CSS link in head tag
<head>

    <!-- Styles -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">

</head>

add the SCRIPT links before ending of the BODY tag.


<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>


<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-gtEjrD/SeCtmISkJkNUaaKMoLD0//ElJ19smozuHV6z3Iehds+3Ulb9Bn9Plx0x4" crossorigin="anonymous"></script>

Now, the Login and register form is designed successfully using Boostrap 5.