Text version of this tutorial:
http://www.wpbeginner.com/beginners-guide/how-to-add-topics-in-wordpress-navigation-menus/

Often people want to separate their content by category for their readers but don’t understand how to do so. If you create a new blank page it will show your readers nothing. In this video, we will show you how to add topics in WordPress navigation menus.

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Summary of this Tutorial:

First, take a look at the topics you want to cover and see if you can divide those topics into categories.

Then every time you write a post about that topics, make sure you set the category for that post.

Next, just go to the Appearance, Menus area and work on your menu. add the categories to the menu and set them how you would like.

Keep tweaking the menu until you have it how you want then save your changes.

Source