Apple Account on Mac
Your Apple ID is an account that lets you access all Apple services. Use your Apple ID to download apps from the App Store; access media in Apple Music, Apple Podcasts, Apple TV, and Apple Books; keep your content up-to-date across devices using iCloud; set up a Family Sharing group; and more. You can also use your Apple ID to access other apps and websites with Sign in with Apple (see Use Sign in with Apple on your Mac in the macOS User Guide).
All in one place. Manage everything related to your Apple ID in the same place. Choose Apple menu 
> System Preferences on your iMac Pro—your Apple ID and Family Sharing settings are at the top.
Update account, security, and payment information. In System Preferences, click Apple ID, then select an item in the sidebar to review and update the information associated with your account.
Overview: The Overview pane lets you know if your account is set up and working properly—if not, you see tips and notifications here.
Name, Phone, Email: Update the name and contact information associated with your Apple ID. You can also manage Apple email newsletter subscriptions.
Password & Security: Change your Apple ID password, turn on two-factor authentication, add or remove trusted phone numbers, and generate verification codes to sign in to another device or iCloud.com. You can also manage which apps and websites use Sign in with Apple.
Payment & Shipping: Manage the payment methods affiliated with your Apple ID, and your shipping address for purchases from the Apple Store.
iCloud: Select the checkbox next to any iCloud feature to turn it on. When you turn on an iCloud feature, your content is stored in iCloud and not locally on your Mac, so you can access it on any device with iCloud turned on.
Media & Purchases: Manage the accounts linked to Apple Music, Apple Podcasts, Apple TV, and Apple Books; select purchasing settings; and manage your subscriptions.
See all your devices. At the bottom of the Apple ID sidebar, see all the devices linked to your Apple ID. You can verify that Find My [device] is turned on for each one (see Find My), see the status of iCloud Backup for an iOS or iPadOS device, or remove a device from your account if you no longer own it.
Family Sharing. With Family Sharing, you can set up a family group and create Apple ID accounts for your kids. To manage your family sharing settings, click Family Sharing in System Preferences and select an icon in the sidebar to review and update your information. You can add or remove family members; share media purchases, payment methods, iCloud storage, and your locations; and set Screen Time limits for your children (see Screen Time on Mac).
Learn more. To learn more about iCloud and Family Sharing, see Access your iCloud content on your Mac.