How to add funds to a apple account?

Hi Avasyam

Welcome to the Apple (user-to-user) Community.

Re: how to add funds to an apple account?

For purchases from Apple:

Your Apple ID is the account that you use to access all Apple services and make all of your devices work together seamlessly. After you log in, you can use the App Store, iCloud, iMessage, Apple Music, Apple TV+ and more.

How to create your Apple ID if you do not have one::

How to create a new Apple ID – Apple Support

Sign in (to your device) with your Apple ID

Sign in with your Apple ID - Apple Support

Check what payment methods Apple can accept in your country or region:

Payment methods that you can use with your Apple ID – Apple Support

The "Related Article" above your question says how to redeem gift cards,

so that you have funds to use on Apple purchases:

If your gift card works with your Apple ID:

What you can buy with your Apple Gift Card or Apple Account balance – Apple Support

Or

To use a payment method, such as a credit or debit card,

to add funds to your Apple Account balance.

If your credit/debit card is one that Apple accepts,

you can list it in your Apple Account

How to: Add a payment method to your Apple ID - Apple Support

and

How to: Add money to your Apple Account balance - Apple Support

All the best :-)