Instead of sharing an account with your child, which can give them unwanted access to your personal data, create an Apple Account for them. Then, you can easily set age-based parental controls, and they can use Family Sharing, Messages, the App Store and other Apple services.| Apple Support
Lockdown Mode helps protect devices against extremely rare and highly sophisticated cyber attacks.| Apple Support
Apple threat notifications are designed to inform and assist users who may have been individually targeted by mercenary spyware, probably because of who they are or what they do.| Apple Support