Why I can’t download an app to my device
Why I can’t even download any app to my device but it kept make me to pay for every app?
iPhone 8 Plus, iOS 13
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I don't fully understand your question.. but I can take a guess.
You need to have a payment method set up in your Apple ID account even to download free apps because many of those free apps will have in-app purchases or trial subscriptions.
So you can add a payment method to your account and then download free apps. If they are truly free, your card won't be charged.
Change, add, or remove Apple ID payment methods - Apple Support