Linux Directory Structure (File System Structure) Explained with Examples
Ubuntu has turned into the Mac of the Linux world. Users are stereotyped as the hipsters and stuff. I used Ubuntu at first, but after realising that it was burning up my CPU all the time, I had to switch flavours.
Command Line Cheat Sheet for Mac and Linux. I know these, but always good to have on hand!
Linux family tree
Learn Basic Linux Commands with This Downloadable Cheat Sheet
Tor for Newbies: How and Why to Use It #infographic
Torrent for Newbies: How and Why to Use Torrent Clients