I found this pretty good for sharing to people, if you're targeting Linux: http://linuxsurvival.com/ http://linuxsurvival.com/ Parts of it are a bit dated (no

I found this pretty good for sharing to people, if you're targeting Linux: http://linuxsurvival.com/ http://linuxsurvival.com/ Parts of it are a bit dated (no longer typically used features), but it's a pretty good overview of how Linux works for end users.