If you're tired of seeing random $2.99 and $4.99 charges to your card, I got you:

Step 1) Visit 'Settings' and click on your Apple ID at the top of the screen

After you've clicked on your Apple ID profile, you should see your image, name, email, and below you'll see a short menu.

Step 2) View your active subscriptions

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.

Step 3) Cancel subscription

Once you've selected the service, you can view the details and cancel the subscription at the bottom of the page.