1. Programming
   1. C
   2. Visual C++
      1. MFC
      2. WinAPI
   3. C#/.Net
   4. Web
      1. HTML
      2. CSS
      3. PHP
      4. ASP .Net
      5. Python/Django
2. Databases
   1. SQL
   2. Access
   3. MS SQL
   4. MySQL
   5. PostgreSQL
3. Other
   1. Mathematics
   2. Foreign languages
      1. English
      2. Deutsch
4. CMS
   1. Drupal