Wi-Fi hotspots in coffee shops, libraries, airports, hotels, universities, and other public places are convenient, but often they’re not secure. If you connect to a Wi-Fi network, and send information through websites or mobile apps, it might be accessed by someone else.

To protect your information when using wireless hotspots, send information only to sites that are fully encrypted, and avoid using mobile apps that require personal or financial information.

Source: United States Federal Trade Commission, www.ftc.gov
For further tips, visit https://www.consumer.ftc.gov/articles/0014-tips-using-public-wi-fi-networks