Apps
Why do I have to put my credit card information I just to download a free game
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You must have a valid payment method on your account to use the iTunes and App Store, even for free content. It verifies that you are old enough to have a credit card and that your address is appropriate for the country-specific iTunes store you are accessing. In addition, you must have a credit or debit card on your account if you have any subscriptions.
There are some ways around it, described in the following links:
Payment methods that you can use with your Apple ID - Apple Support
Change or remove your Apple ID payment information - Apple Support
If you can't choose None when you edit your Apple ID payment information - Apple Support