Free wi-fi networks are set up in public places by marketing firms who are willing to give you some bandwidth in return for an email address and phone number. The only effective way of protecting yourself against snooping is to install a VPN. Sticking to apps from big, well-known names will limit the risk. Make sure all your security software is up to date and make sure youre not sharing folders with others on public networks. On Windows, head to the Control Panel and change advanced sharing settings.”]
Source: https://gizmodo.com/how-to-stay-safe-on-public-wifi-1779464400