With Screen Time, you can access real-time reports showing much much time you spend on your device.
The 3 Best Parental Control Apps to Manage Screen Time (and Keep
Multitask with Picture in Picture on iPhone - Apple Support
How to add and edit widgets on your iPhone - Apple Support (CA)
Access features from the iPad Lock Screen - Apple Support
How to use AirDrop on your iPhone or iPad - Apple Support (CA)
How to stop sharing your iPhone or iPad location - Apple Support (CA)
If your Apple ID is greyed out in Settings - Apple Support (CA)
Set up Family Sharing - Apple Support (CA)
Use Screen Time on your iPhone, iPad, or iPod touch - Phonewarehouse
Set up your iPhone or iPad - Apple Support (CA)
Update your iPhone or iPad - Apple Support (CA)
iOS 12 - Wikipedia
Use the Health app on your iPhone or iPad - Apple Support (CA)