¿What are those ways?

A small example would be to set the device into "kiosk mode" which many companies use for their employee devices too. Prevent app installs, check what pages ur kids visit with their browsers and whatnot. Just make sure to be open about it so you don't hurt your kids by violating their privacy and trust towards you. Hell we even got parents having their kids take air tags with them so the parents know where they are.