Do Not Invite Strangers to Your Home
There’s nothing wrong with selling one-off items on the Internet, but if you do so, try to avoid inviting strangers to your home. If you do not know them, there is a chance they can be on a reconnaissance mission, scoping out your place for a planned burglary at a later date.
You should ALWAYS meet them in a public location of your choice, one where there are plenty of people around to witness – if anything were to go wrong. This provides the best level of security, and not inviting them to your home to complete an interaction, could very well result in further damage to your home.