blog/database/seeders/DatabaseSeeder.php

<?php

namespace Database\Seeders;

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

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {
        //\App\Models\User::factory(10000)->create();
        Post::factory()->count(10000)->create();
    }
}