One important topic is identity theft, where your identity will be stolen and abused by criminals online.
Consider this: because when we speak of identity theft, most people reason that it is only strangers who are capable of stealing their identity, and because of that, they let their guard down when they are with people they consider close friends and even family, keeping important details about themselves that should be personal carelessly.
Identity theft can be carried out by anyone, not just strangers. Some of your closest friends and family can decide to impersonate you when the opportunity presents itself.