Access all Apple devices and services with your Apple ID.
Apple iPhone - Create Apple ID
Where can I use my Apple ID? - Apple Support
How to sign up for an Apple ID - Apple Community
How to create an Apple ID without an email - Quora
If you forgot your Apple ID - Apple Support
How to back up with iCloud - Apple Support
If your Apple ID is greyed out in Settings - Apple Support
What's an Apple ID? Creative Tech Support
How to use a multiple domain strategy for SEO - IONOS CA