File and Printer sharing when on, means that other people can view or access your data. This poses as a risk as your information may fall into wrong hands. So always make sure to disable Files and Printers sharing.
This is a feature that is provided with the OS where you can check the health of your system. The window provides option to Scan, check for Vulnerabilities, check Device performance, Device security, App & browser control and also provides parental control.