Here is a link for a Linux tutorial for those interested in Pentesting. This tutorial was originally posted by a participant in the Linux Huddle Slack Channel so it it looks familiar that is why. The tutorial focuses on installing a virtual machine, Kali Linux and working at the command line. It is a good primer to Linux, though someone would not be a pentester once you complete the tutorial. But a good set up to those going through the PenTest+ course that need a little help with Linux.
Linux for Ethical Hackers (Kali Linux Tutorial)
Linux for Ethical Hackers (Kali Linux Tutorial)