With this blog post I hope to make clear why Rules is an important part of the Drupal ecosystem, and why you as a developer should know it.
At the begining of this year(2011/01/23), I saw Johan Falk's impressive blog on NodeOne website, The Drupal Learning Curve: a configurators view, tried to categorize different stages in Drupal learning curve by the skills and abilities of configuration. I I commented the blog, asked if I can translate it into Chinese and got permission from the author. After that, I posted the Chinese but somewhat trimmed version of this article, 【截譯文章】Drupal學習曲線：一個設定師(configurators)的觀點on Drupal Taiwan and got some responses. Now on my own website, I did the translation again in totally detail way. You can see it on this article's Chinese version, Drupal學習曲線：一個設定師(configurators)的觀點.
While tried to use Drupal 7 at the very begining, I noticed that ckeditor didn't work stably: it would show itself on some content type nodes, but not the others.