source: database/seeds/RolesTableSeeder.php

<?php

use Illuminate\Database\Seeder;

class RolesTableSeeder extends Seeder
{
        /**
         * Run the database seeds.
         *
         * @return void
         */
        public function run()
        {
                DB::table('roles')->insert([
                        ["name" => "admin"], // Have access to all users(managing users), posts, comments, etc
                        ["name" => "editor"], // Have access to all posts, comments, etc
                        ["name" => "author"], // Have access to only their own posts and can publish
                        ["name" => "contributor"], // Have access to only their own posts can't publish
                ]);
        }
}