One thing to watch out for is what is called an evil-twin. Essentially its someone setting up an ssid that looks like the hotspot's ssid. But if you connect to it then all your traffic is intercepted and viewable by the hacker.
If your firewall has a public setting, then remember to use that when connecting to a hotspot. Because usually a private network setting allows things like File and Printer Sharing. And you don't want to share your files when you're connecting to a hotspot.
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