As others suggested, the examples in the kivy_installation directory are there to help programmers understand how basic tasks can be done using kivy.
There is also this snippet wiki where we encourage people to put there snippets in the user snippets section.
You could also look at the your first widget section in the programming guide
I guess we need to be better at explaining that. There is an effort at a new getting started that aims at helping to introduce the different parts of the documentation that are otherwise not quite obvious to new comers, suggestions are welcome. You can open a issue on github for documentation, we will be also adding a suggestion section to the documentation.
