Apple Devices – Screen Time Monitoring
If you are an Apple family, I strongly encourage parents to use the “Family Sharing” feature. This allows you to ensure, your kids can’t buy/install things without you approving first.
Setting up Family Sharing allows you to setup restrictions on Screen Time and how much they can use certain apps.
Here is the link that explains the feature
https://support.apple.com/en-au/HT208982
Here is another guide that helps set things up for yourself and your family.