Answers for "laravel seed data to existing"

how to make db seeder in laravel

php artisan make:seeder UsersTableSeeder

laravel 8 seeding

/**
 * Run the database seeders.
 *
 * @return void
 */
public function run()
{
    $this->call([
        UserSeeder::class,
        PostSeeder::class,
        CommentSeeder::class,
    ]);
}