

Yeah, the definitions are actually more about alignment with the US political parties rather than left or right. And since both parties are demonstrably right of center, just to different degrees, the bias meter should only be used to determine which political party’s sponsors likely biased the article.
For example, an article saying climate change is not human caused and presenting debunked evidence will be ranked mostly center and second mostly right. But an article calling for incentives to reduce use of fossils fuels will be ranked mostly left. That’s mostly center if anything. An article calling for the government to explicitly force companies to stop using fossil fuels would be mostly left and center. One further advocating for the government to take over energy companies that don’t comply and make energy production public would be mostly left. Just presenting scientific evidence and refusing to give a voice to debunked “alternative facts” is not a leftist position, it’s a centrist one at best and should be the baseline.
Do you mean this config option?
[server] hosts = 0.0.0.0:5232, [::]:5232
That is binding the service to a network interface and port. For example your computer probably has a loopback interface and an Ethernet interface and WiFi interface. And you can bind to an IPv4 and or IPv6 address on those interfaces. Which ones do you want radicale to listen to traffic from and on what port? The example above listens on all interfaced both IPv4 and IPv6 and uses port 5323 on all. Of course that port must not be in use on any interface. Generally using this notation is insecure, but fine for testing. Put the real IP addresses when you’re ready.