With Christmas just around the corner, the holiday period is a great time to take stock of the devices they have (plus any new Christmas devices) and ensure they are set up correctly with any parental features you feel are appropriate for your child.
One frustrating issue is that the available features and how you set devices up differ, so to help parents Internet Matters have really good, non-techie guides which you can follow as part of their ABC Checklist. ABC stands for:

A - Activate parental controls

B - Balance screen time.

C - Check and chat.

You can find a full explanation, set up guides and excellent advice  HERE.