Screen time

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

Perhaps you didn't read the support article I posted (below the video), this one:--> Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support

Regards

Giulio