Category:Main Index
This is the 1 topmost category.
From here you can descend into the subcategories which collect Wiki articles for you.
Each Wiki article should be in one of these categories; optimally there should be no
When putting articles into categories, please do not produce clutter by putting your article into every possible category you can think of. Instead, consider the most detailed one that fits for it, and put it into there. For example: if your article is about LEGO Digital Designer, you should only put it into Category:LEGO Digital Designer, and not additionally in the parent Category:Software, etc.pp. We need to keep this Wiki structured and well-organized.
If you want more information on what a category is, see Wikipedia: Help:Category.