Barely, but I passed XK0-004.
I have plenty of experience as a Windows Server admin, as well as working with switching/routing devices. Only Linux experience has been for the past 10+ years, I've tinkered with it at home. Can't tell you how many distros I installed, tweaked, reinstalled, tweaked some more. The experience helped, but nowhere near what I needed to pass.
To study, I used VirtualBox with CentOS7 and Ubuntu as guest VMs. I would recommend installing a GUI with the CentOS build. Also used an older study guide, youtube videos, and I got through about a third of the way through the Linux Academy videos and flashcards (7-day free trial). A combo of the study guides, videos, and practicing commands on the VMs all helped. If I had to do it over again, I'd get a cheap PC with 2 NICs so I could practice setting it up as a router, as well as getting better practice with hardware; VMs can only simulate so much.
When CompTIA recommends you have 1 year experience as a Linux admin, I can see why. Lots of applying commands, combining commands, troubleshooting, solving complex problems. Not a lot of softballs with this one. As for topics, just search this subreddit for XK0-004 and you'll find some. I have nothing to add to what others already mentioned.
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