The knowledge base category could be a basic wiki category. Pages here would be visible to anyone, and could be edited by anyone, or at least members with a certain level.
(Replace this first paragraph with a brief description of your new category. This guidance will appear in the category selection area, so try to keep it below 200 characters.)
Use the following paragraphs for a longer description, or to establish category guidelines or rules:
Why should people use this category? What is it for?
How exactly is this different than the other categories we already have?
What should topics in this category generally contain?
Do we need this category? Can we merge with another category, or subcategory?