Questions

Categories (or Cats) are descriptive terms used to sort your Cell's or site's content, such as images or lists.
Categories are in Organize>Cats
Simply enter the relevant words as Categories (ie. portrait, landscape) and give each one a unique number (cat id), you can also enter a short text for each category.
Once the categories are set, they can be used on your Cell and/or site in a variety of ways.
Each Category can be switched on and off, as needed.