Just check the below post about Apple ID. I have discussed everything which you need to know about Apple ID, i.e. create, delete, manage Apple ID.
What is Apple ID?:- A User Apple ID is the account which they use to access all kind of Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and many others. And you can sign in to all Apple services with a single Apple ID and password.

How to Create Apple ID?:-
You can easily create an Apple ID when you set up a new device or going to sign in to your iTunes or iCloud for the first time.
Below are the essential things which you need to know before creating Apple ID:-
1.A valid email address to use as your Apple ID username
2.A strong password which is difficult to crack
3.Your date of birth.
4.Three security questions and answers to verify your identity. You can also use this information to reset your password.
If you use two-factor authentication, you are all set for creating an Apple ID. You are now the only person who can access your account, even if someone knows your password. If you don't use two-factor authentication, you also need to provide a rescue email address.
Sign in with your Apple ID
Use the same Apple ID and password every time you're asked to sign in to an Apple device or service. With your Apple ID, you can:
1.Sign in to your iCloud to keep your personal content up to date on all your devices.
2.Sign in to the iTunes, Books, and App Store to make purchases and access previous purchases.
3.Sign in to iMessage and FaceTime with your Apple ID to talk and text with friends, family members and your relatives.
4.Sign in with your Apple ID when you set up a new device.
Manage your Apple ID:-
Because your Apple ID is used across all your devices and services, it's important to keep your account information up to date. Simply sign in to your Apple ID account page at any time to manage your account:
1.Update your Apple ID email address* to make sure it's an address which you use frequently.
2.Change your password to help maintain the security of your account.
3.Manage your payment information to keep your payment method or billing address up to date.
4.Add additional email addresses to help people find and communicate with you on Apple services like FaceTime, iMessage, and Find My Friends.
5.See and manage the devices you're signed in to with your Apple ID.
6.Change your verified phone number.
I hope this mini guide will prove helpful for you in understanding about Apple ID in a much better way.