LiV Pi - LiV Pi's capabilities and instructions on how to configure it
LiV Pi Forum - user forum
Raspberry Pi - everything you need to know about Raspberry Pi (don't forget to check out the forum)
Introduction to Linux - video course provided by the Linux Foundation
Linux Journey - a good Linux tutorial for beginners
Introduction to Linux - detailed Linux book
Unix/Linux - nice tutorial, well organised
Linux command line - everything you need to know about the shell
Debian System Admin Handbook - advanced book for sysadmin. Most recent Raspbian OS is based on Debian Stretch, so this must be worth browsing if you want to get the most out of your LiV Pi.
More links to come....