Hi demetria23,
Welcome to the Apple Community, where some of us do our best to help each other :)
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, FaceTime, Apple Music, Apple TV+ and more.
To use the App Store or iTunes for the first time,
even if you are downloading a free App,
you still need to have a payment method listed in your Apple ID account.
If you already have an Apple ID, and have changed your Apple ID or Apple ID password lately:
You might need to update on any Apple services etc, including the App Store
What to do after you change your Apple ID or password:
https://support.apple.com/en-au/HT204071
How to create your Apple ID if you do not have one::
https://support.apple.com/en-au/HT204316
Payment methods that you can use with your Apple ID:
https://support.apple.com/en-au/HT202631
How to Change, Add or Remove Apple ID Payment methods
https://support.apple.com/en-au/HT204071
After you have used the App Store and iTunes for the first time,
it is possible to remove the payment method,
How to remove payment methods from your Apple ID.
https://support.apple.com/en-us/HT204034
Hope this helps you :)