I have this cafe in the building where I live, so effectively I have free wifi... is it dangerous to use such a public wifi for your everyday surfing and stuff? What are the privacy concerns?
Basically it just means that anyone could be on your same network. If nobody wants to "attack" you, there is no issue. It is a bit like asking "are there risks to walk alone in the middle of the night in an empty road"? Well, no. But if something were to happen, you'd know why it happened there.
You can use that WiFi, be sure to have your firewall enabled, an antivirus (keep it up to date), download and execute stuff from reputable sources and just beware that anything you connect on that network may be accessed, so set passwords that are...