I've noticed you tried to add some pages but you incorrectly made them categories. Categories should not be text but instead shows pages that are placed in that category while pages (which is what I think you were trying to do) are more for lists and text. If you need help settng up the page, let me know and I'll see what I can do :)
I guess those four types of items should be listed on their own page since they are referenced directly in game as such. (Chest Armor, Gloves, Trousers, and Boots) I was also trying to clean up this page slightly to make it more complete.
Sure, they can have their separate pages. However, naming conventions should include the game name, like "The Witcher 3 heavy armor" "The Witcher 3 trousers" and so forth (we tend to keep the names lowercase unless it's actually capitalized in the game/books). If you need an idea for a layout, see The Witcher 3 silver swords pages. And if you're having problems with the code, let me know.
Also, links are direct. As in, if you highlight the word in visual editor, it'll automatically try to select from within the wiki, but you'll need to double-check to make sure it's the right one (as sometimes the name is used for other things, like Unicorn).