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    Hello, in order to display your categories, you have to add them as sub-categories of the Root Category. This doesn't mean that you can change the Root Category or have more than one with multiple stores, but to show the categories in the menu, you have to add them as sub-categories of the main category, in this case is the Root Category.

    To show the category in the carousel below the slider, you have to add the category id in the line you mentioned, this is only for showing one category, if you want to show products of more than one category, you can make a category only to display in the carousel, and add the differents products there, of course this category will have to be setted as Display in menu: NO, in the category configuration, so it will not be displaying in the top menu.