There are no gift card generators - they are spam.
Yes, the 50 Amazon gift card is legitimate.
Yes, the 60 Amazon gift card is legitimate.
An iTunes gift card generator is generating a fraudulent gift card number and so is illegal. They are usually a scam (See links below) and best avoided.
buy a amazon gift card presumably
yes possible i always purchase from mtcgame they have different payment method on Amazon gift cards To suit everyone in all countries
Amazon may be giving you a gift card as a promotional offer, a reward for a purchase, or as a gesture of goodwill.
Only Amazon.com accepts an Amazon gift card.
itunes gift card generator
There is no itunes gift generator that I know of, you have to buy them via iTunes or some other shop
When purchasing a gift card you will receive a code, you can then email the code.
Yes You can buy a computer using Amazon gift card
No, Amazon does not offer cash back on gift card purchases.