This is part of the Wiki Maintenance. The link for categorizing pages is here.
Rules for categorizing pages
- Don't categorize "duplicate" categories to articles. Because the duplicate categories will soon be removed from the wiki.
- When adding more than one category to a page, don't just click "Add category" and click "save" and repeat the process like 4 times. It will take up the recent wiki activity so please don't do this.