Where should i write raw-query or query using query builder instead of writing it in route file in laravel?

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class testing extends Model
{

}

should i write my all queries in this model class,even if i just want to use query builder no eloquent?

what are the good practices to write raw query or using query builder?

via Chebli Mohamed