You should do this from time to time, especially after adding a new application to see what is visible.

Special Cases

Occasionally specific operating systems have some security concerns that are specific to said operating systems. for example users of Raspberry PI's have to worry about disabling the default "PI" user on older Raspberry PI's, something that other operating systems do not have to worry about. Likewise Ubuntu users have to worry about turning on their firewall since it comes turned off by default, see UFW - Basics. While we do have specific pages for the most common issues, it is always good to check with the makers of each operating system for system specific security issues. Please note that Debian, Raspberry and Ubuntu are all non-supported operating systems, all help for them is "best effort". If you install these non-supported operating systems on your personal computer, you are essentially taking responsibility for your own security.

Centos - https://wiki.centos.org/HowTos/OS_Protection

Debian - https://www.debian.org/doc/user-manuals#securing

Fedora - https://fedoraproject.org/wiki/SecurityBasics

Raspberry PI - https://raspberrytips.com/security-tips-raspberry-pi/

Ubuntu - https://help.ubuntu.com/lts/serverguide/security.html