Creating a new page on your website
If you would like to create a new hierarchy, start by creating two new pages on your website. If you are not sure how to create a new page, let me just remind you briefly: -
Go to your dashboard, Pages, select "Add New". Name your page. In our example, we will name it "Lessons." If you like you can publish the page so that it can be live as you continue to work on it.
Repeat this process and create another new page. In our case, we will name it Lesson 1.In your case you can name your pages according to what you want displayed on your navigation menu.
What do we want to do with the two pages we have created?
We want the first page "Lessons" to be the parent page and "Lesson 1" to be the child page. In other words we want to make the one page the main page and the other one the sub-page assuming that your big idea lies with the main page then the child pages will build up on the the main page. So that means that the child page should have sub-titles which can be divided into other sub titles.
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I use categories instead of pages and I include them in my Main Menu.
When I create a new post for the specific category, I include the post in the Main Menu and I drag it under the category.
I've been busting my head trying to figure out how to include Keywords in the post titles and at the same time I didn't want them to appear in the navigation menu. Now I know.
Once again kudos for the excellent presentation.