For those who like to learn having fun, there is a great tip:
“Ubunchu!” is a Japanese manga series by Hiroshi Seo featuring Ubuntu Linux. Three school students in a system-admin club are getting into Ubuntu!
Offical site: https://seotch.wordpress.com/ubunchu/
Translations available at: http://divajutta.com/doctormo/ubunchu/c1.html
Currently there are 8 episodes released and 7 with english translation.