iao_team/app/Models/MemberCategory.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class MemberCategory extends Model
{
    use HasFactory;

    protected $fillable = [
        'member_id',
        'category_id'
    ];

    public function member()
    {
        return $this->belongsTo(Member::class);
    }

    public function category()
    {
        return $this->belongsTo(Category::class);
    }
}