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The Reluctant Sysadmin's Guide to Securing a Linux Server
Pretty basic but guess what?
You have to get the basics right or you're up the creek no matter how smart you are.
https://pboyd.io/posts/securing-a-linux-vm/
Seems Debian/Ubuntu focused. I can't say what's different with RH variants.
Things are different with openbsd, but that's less frequently found on virtual machines, the concern of the post. I'll look for a guide, but it should be secure off the bat.