How to sync iPad and iphone

You’ll need to ensure that both iPad and iPhone are signed-in to iCloud with the same AppleID - and that you have enabled all the Apple services (such as Contacts, Calendar, Reminders, Passwords/Keychain etc.) that you wish to synchronise between your devices.

Settings > [Your Name / AppleID] > iCloud

All Apple services and Apps that can be synchronised between devices are listed here. Enable as required.