I want to know how to redeem my Apple gift card

See -> How to redeem your Apple Gift Card or App Store & iTunes gift card

How to redeem your Apple Gift Card or App Store & iTunes Gift Card – Apple Support (UK) 

See also:  If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

Beware of -> About Gift Card Scams -> About Gift Card Scams - Official Apple Support

Realize that this is not live chat. Expecting a reply in less than two minutes after making the first post is a bit much. If you are having problems redeeming a gift card, review the possible reasons and suggestions listed in this support article --> If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

If your issue is not listed, follow the directions at the end for contacting Apple Support.