Good resource to learn linux from scratch.
Download the zip file in the repository ( https://github.com/beginners-101/Linux-Essential-For-Beginners/blob/master/Linux%20Essential%20For%20Beginners.zip ) and Unzip it.
you'll get bunch of file including "notebook.nbk" , you can open this in KeepNote software.
Download and Install : http://keepnote.org/ to view the notes.
If you don't want to download it then go to each folder and open page.html file in browser.
See the Introduction to take a Overview of what you are going to learn in this .