Talk to them about the apps they use and the content they enjoy. Having regular conversations means you can stay on top of their device use while giving them space to come to you if they need support.
Learn how they communicate with others as they become more socially active online and draw from friends, passions and online sources to build their identity.
The more you get involved and understand the things your teen does online, the easier it is to gain their trust and guide what they do in their digital world.
Additionally, making screens part of family time, like a movie or an online games night, is one way to make screen time active to positively impact their wellbeing.