You need to thank Loes. She is the expert who helped me learn regarding this issue.

This should do the job

What is the code for?
Why we delete this "No follow" page?

Here you can read about the why Nattawut How and Why to add No Follow and Target Blank

Thank you so much
This is the protection for dropped ranking.

I probably should because a lot of my third level menus point users to other sites.

For example my Main Menu is INSTRUCTION (This page has original content that I have written).

One of my second level menus is GUITAR LESSONS (this page is blank - no content).

Then one of my third level menus is JAMPLAY LESSONS. This is a link to the JamPlay website which gives users choices of guitar lessons. It has my affiliate link, so if users buy anything from this page I receive a commission.

I could add content to my second level GUITAR LESSONS. I could talk about a lot of things related to lessons. I could also provide a list of all the pages in my third level on this second level page.

Or, I could leave the second level, GUITAR LESSONS page blank. I need to know which approach is best in terms of Google rankings.

Blank pages are no good Marty, no good for Google and also no good for your costumers.

I have an idea, you add an intro to the content what you are about to write, 2-3 sentences

Put a contact form beneath it to subscribe and tell your visitors that you will send them the link as soon as you have written the lesson/post

That is a win-win situation

That's an interesting approach, Loes! I like it because it is interactive. Do I need a plugin for the contact form? If so, do you suggest a particular plugin? I already have a subscription form on my front blog roll page for folks to automatically receive new blog posts.

Yes you need a plugin, I like the plugin
WPForms
You can add some questions to it as well

I need to have second level and third level menus, otherwise, when users hover over my Main Menu, the list of menu options that would show up would be excessively long.

I break up my subjects into second level topics, and then add third level menus related to those topics;.

I understand that. I'm just not sure it explains the blank pages though. Ill take a look at the site later so I see everything in context.

Yes, that would be one option. I didn't know you could have a blank page by adding a #. I'm wondering, however, if this approach would be better for Google rankings, or having textual content in my second level pages.