Keep every app updated regularly
Delete any app not used for a while… say 3 months
If needed go to Accessibility settings and make apps larger (avoids clicking incorrect apps)
Check facebook, whatsapp, text messages, instagram (and remove fake looking suspious connections) Setup up autoshare with limited friends.
Delete open webpages (and show them how to do it to them – closing the app does not close the page)
…and please do this every few days/weeks