If you are trying to learn a language like ruby or python like me and have no idea were to start or you have never work with a language and have no idea what to expect, yingzhi will help u extremely.
Yingzhi is a app in cydia
It has an easy interface that can be change to better help you, it also cones with different documents that explains what the language consist of.
It also has an interpreter and easy short cuts. And more
PLEASE move this if it is an the incorrect section