I love to acquire new skills. And writing down what I learned really helps me to consolidate my knowledge (and to improve my English skills). That’s why I started to write these tutorials. While researching facts for a comprehensive tutorial I acquire the missing 10 percent of a topic. And of course, you can now profit from it, too.
The selection of topics depends on its relevance: if several articles already exist on a subject, I don’t have to write another. Common topics are new TYPO3 features, like Routing or the Form Framework. These are supplemented by more general topics of web development.