Here's a wonderful resource that Red Hat used to charge for and they now give it away for free.
If you are ased by someone how to begin with Linux, point them to this free Red Hat Course:
30 days free access
It's catagorized as an introduction to Linux, but if someone were to actually go through that entire course and practice it, it's a decent foundation.
Anyway, it's a good resource to share with those who are new to Linux
A collaborative learning environment, enabling open source skill development.