Answers for "seed in laravel;"

laravel run seed

#All of them
php artisan db:seed
#One class
php artisan db:seed --class=UserSeeder

laravel database seeder

namespace Database\Seeders;

use App\Models\Category;
use App\Models\Post;
use App\Models\User;
use Illuminate\Database\Seeder;

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {
        $users = User::factory(2)->create();
        $categories = Category::factory(3)->create();
        Post::factory(3)->create([
            'user_id' => $users[0]->id,
            'category_id' => $categories[0]->id
        ]);
 
        Post::factory(3)->create([
            'user_id' => $users[1]->id,
            'category_id' => $categories[2]->id
        ]);

    }
}