When I first looked at three.js (January 2016) and then from September, I looked for simple examples. But often the good examples of old revisions and do not run with the new revision! The official examples are then overloaded with other things and the essential is difficult to recognize.
For beginners I have programmed some examples. However, at the beginning even the variables German, later only the comments.
A blog only in german. http://xprofan.net/intl/de/php,html,js/3d-grafik-webgl-mit-three-js/
My English is very bad, so I use google translator and dicct.cc.
You can look at the examples (source code only CTRL + U)