this post was submitted on 27 Sep 2024
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Worth noting that if you're trying to block telemetery or ads or things like that, using an adblocking dns is probably the better option. Either through a pihole on your network or some online adblocking dns.
Other than that, if you're looking for one because you think you "need" one, don't worry too much if it's just a personal computer connected to a router. Most distros ship with sensible defaults for security.
If you actually want to use a firewall, block all incoming and allow all outgoing is a reasonable rule of thumb if you aren't running a server. Note that "block incoming" doesn't block connections that the system itself started.
Blocking incoming traffic and accepting outgoing traffic is usually the default for distributions anyway.
Not unless it is a server distro
Debian is a notable exception.
Not really