$comentarios = $this->comentario::with('user')
    ->where('serie_id', $request->get('serie_id'))
    ->orderBy('created_at', $filtro)
    ->limit(2)
    ->offset($offset)
    ->get();

$query = $this->comentario()
              ->with('user')
              ->where('serie_id', $request->get('serie_id'));

$quantidade_comentarios = $query->count();

$comentarios $query->orderBy('created_at', $filtro)
       ->limit(2)
       ->offset($offset)
       ->get();

{
   "total": 50,
   "per_page": 15,
   "current_page": 1,
   "last_page": 4,
   "first_page_url": "http://laravel.app?page=1",
   "last_page_url": "http://laravel.app?page=4",
   "next_page_url": "http://laravel.app?page=2",
   "prev_page_url": null,
   "path": "http://laravel.app",
   "from": 1,
   "to": 15,
   "data":[
        {
            // Result Object
        },
        {
            // Result Object
        }
   ]
}

$comentarios = $this->comentario::with('user')
    ->where('serie_id', $request->get('serie_id'))
    ->orderBy('created_at', $filtro)
    ->paginate(2);

paginate(int $perPage = null,
         array $columns = ['*'],
         string $pageName = 'page',
         int|null $page = null)