If you're tired of seeing random $2.99 and $4.99 charges to your card, I got you:
After you've clicked on your Apple ID profile, you should see your image, name, email, and below you'll see a short menu.
After clicking 'Subscriptions' on the menu, you should see all active (and inactive) subscriptions.
To view the details of each, simply click on the desired service.
Once you've selected the service, you can view the details and cancel the subscription at the bottom of the page.