Screen time
How to set up a screen time on my iPhone for my kid?
iPhone 8 Plus, iOS 14
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You can start taking a look at this video:
https://www.youtube.com/watch?v=BacXAmS6DLQ
After that you can read this support article for parental controls:--> Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support
Regards
Giulio