Hello @Suzen, welcome
The category names are pretty much self-explaining.
For support the Support category, where you probably want to post,
Resources (read-only topics) is a must-read documentation,
In Development Testing we discuss new ISO/s features and early discovered bugs, mostly regarding Cooker (or new apps or such)
Don’t worry, if you by chance post in someway wrong place we’ll move discussion to the proper category and let you know.
Be sure to give a descriptive title and provide info about your system (ROME, 5.x Rock, or Cooker etc.)