Have purchased an iPad for my wife. I downloaded my iPad to the new one.
How do I keep the iPads apart?
iPhone 6, iOS 12
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If you have transferred all data from your own iPad to a new device that is intended for a different user, you might be best advised to wipe it - and then setup “as new” for the intended user, creating a new AppleID account if one doesn’t already exist. Everyone should have their own AppleID - that is used with their own devices.
To do so, begin by following this process to erase the iPad and properly prepare it for a fresh set-up:
What to do before you sell, give away or trade in your iPhone, iPad or iPod touch – Apple Support
Once prepared, you can set-up “as new”:
Set up your iPhone, iPad, or iPod touch - Apple Support
If you’d like to share purchased Apps and Apple Services, you can use Family Sharing:
Set up Family Sharing – Apple Support
Share App Store, iTunes Store and Apple Books purchases with Family Sharing – Apple Support
https://www.imore.com/how-set-up-family-sharing-iphone-ipad