I get charged money every month and do not know why

Please consult: If you see "apple.com/bill" or an unfamiliar charge on your statement - Apple Support

In addition to the post above, check this link to see or manage your subscriptions --> See or cancel your subscriptions - Apple Support

You may also wish to check your Subscriptions, to see if you have a recurring subscription you are not aware of and you may wish to cancel it. See or cancel your subscriptions - Apple Support