It is possible to insert your own accompanying text for each category and subcategory. You can manage it in the administration via the Categories / Category list section. To edit the article you are reading, select Left and Top Menu / Clothes. More detailed information on setting up and managing categories can be found here.
By default, the top menu is the same as the one in the left column. If you want to divide them, you can do so according to the instructions here. Using categories, it is also possible to create separate pages that will not be displayed in the menu (more here).
The Advisor module is used to create and share hints and instructions. The advisor helps visitors to better orientate themselves in your offer. For example, if you sell shoes in a given category, you will include an article on how to choose it and a table of sizes in the guide. You can create these tips in the Content / Articles section. You then assign them to a specific page in the Advisor section (tutorial)