Introduction
In a website, a Parent page is the main page that presents itself on top of the hierarchy while other pages come under it. The sub page that comes under the parent page can be called a child page.
Do you really need parent pages on your website?
Having a parent page on top and a child pages under it allows you to arrange your pages in hierarchical manner or in folder form. For example lets say you have a Parent page named Lessons, the child pages can be: Lesson 1, Lesson 2, Lesson 3 etc.
A Child page can also be a parent page to another child page that means in your hierarchy you will have Parent page=>Child page==>Child page. So, in our example of parent page of Lessons the hierarchy on the navigation menu can be like this:
Lessons=>Lesson 1==>Introduction
Note: NOT all THEMES supports hierarchies on the navigation menu. Some will. some will not, so you will need to check if your theme will be able to support what you want to do before you invest a lot of time on it.
The hierarchy helps to arrange your website in a easy manner. It enables the publisher group together the pages that talk about the same aspect. Also it gives room for continuity and readability of the website. In other words the, author can use this tool to arrange his/her work in folders such that the reader will find it easy to access SPECIFIC information any time.
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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.