Newbies and not-so-newbies might appreciate this new website called Linux Journey (http://www.omgubuntu.co.uk/2016/06/learn-linux-great-new-website-linux-journey). Put together by Redditor Warby Darby, it is nicely designed to help people learn how Linux works. Subjects are categorized and broken down into ‘lessons’. Most have a set of exercises and an interactive quiz. Examples of topics: command line, user management, packages, file system, init system, network basics. Take a look at this; I think even intermediate users will get something out of it.
Cool learning resource. Thanks for sharing.