I am getting charges .99 for a subscription every month and I don't know what for?

You can use the following instructions to view your subscriptions: How to cancel a subscription from Apple - Apple Support

Another possibility for a monthly 99¢ charge is for iCloud storage that was upgraded from the free 5GB to the 50GB plan. Usee following instructions to see what plan you have and to downgrade if desired: Downgrade or cancel your iCloud storage plan - Apple Support

If the above doesn't help, see each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help: If you see 'apple.com/bill' on your billing statement - Apple Support