A Categories Menu helps your subscribers and readers to sort through your blog posts and easily find topics of interest. Most websites and blogs will have a categories menu on the sidebar on the blog page. This tutorial however shows you how to place it horizontally at the top of your blog posts and also to make it sticky as well. There’s no code required to achieve this thanks to the powerful features of the Divi Theme.
If you’re just getting started with wordpress and haven’t settled for any premium theme yet, then I suggest you go with Divi by Elegant Themes. If you already have a theme you’re using, then get the Divi Builder Plugin to use the Divi page builder with any theme.