Why cant i download apps from app store even free ones without being asked for pruchase methods ?

Because you have to have an account to download. Some apps require parental approval.

Hi Fares 21,

Payment methods are part of the requirements for an Apple ID. There should be an option in the card information to choose None. If you don't see that option, this article might be helpful: Why can’t I select None when I edit my Apple ID payment information? - Apple Support