If you navigate to a category, you will find a post with the title "About the ___ category" where ___ represents the name of the category. You can open that post to see what the category is about.
The first few lines of that post will also show when you hover the mouse over the category name as shown below
Unfortunately the "About the IDE 1.x category" is not quite correct anymore as it mentions the IDE without a version; this is part of the history of the forum and was never adjusted.
Note that in general we're not too critical; there is often a thin line and a question might fit in multiple categories. We just try to keep it organised.
@pert
1
The description for IDE 1.x states
Can you please adjust this so it reflects IDE 1.x?
2
The description for IDE 2.x states
Maybe time to adjust this as well? It's not really testing anymore 
And maybe add "NOT for problems with your project.".