One I follow is the KDE Blog (https://blogs.kde.org/index.xml#feed)

https://terminaltrove.com/new.xml

I see most are covered but I have a couple more:

Fedora Magazine

It's FOSS

Bazzite

GamingOnLinux

This Week in Plasma

This Week in KDE Apps

Fedora Magazine

They're actually podcasts that have RSS feeds for following new episodes. I don't know if podcasts are your thing. They weren't mine either, but now I put them on when I go to bed and listen to banter about Linux and FOSS. 😄

Destination Linux

Late Night Linux

This one's pretty good

Phoronix and Gamingonlinux are awesome!

A few I have not mentioned yet

https://lwn.net/

https://linuximpact.com/

https://www.linuxserver.io/blog.atom

https://www.linuxuprising.com/

https://www.osnews.com/

i love https://thelibre.news/

Slashdot? It's ok but I still looking for a favorite. Maybe in these comments...

Btw feeds makes more sense than rss feeds, all feed readers also take atom feeds ;)

Pointieststick, Itsfoss, GamingOnLinux, KDE Blogs

Slashdot

On The Metal

This Week In Linux

Destination Linux

[https://linuxgamecast.com/feed/lgcweeklyaudio](Linux Game Cast)

Arch Linux Security Advisories

https://omgubuntu.co.uk/feed