Linux Journey -- A beginner's resource for learning Linux
I came across an interesting public service that helps guide you through the Linux realm, Linux Journey. 

I have no experience with this service whatsoever, but just by scrolling around on it, I think it is something that I will use in the future, so here I am sharing it with thou'st who browse GreySec. Hopefully, someone finds a good use for it.

Enjoy your free Linux education!
Looking at the site it also appears to go over hardware aspects of Linux, and also provides information for the basics of Networking. Nifty, would've been great if knew about this awhile ago though.
this youtube channel have some good videos about Linux internal  as system engineering approach

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