I am wanting to create a blog that has two or possibly if I create enough content three blogs which would have different themes or subject matters.
For example in the top menu, I know how to have the home page, an about page, and other pages, but how would I go about having different pages for, blog: subject 1, blog: subject 2, blog: subject 3, podcast….etc?
You can only create one blog per WordPress installation. Within that blog, you can have multiple categories, or topics.
Then, you can simply add links to each category/topic within your top menu. In other words, you would NOT add a link your blog in the menu; instead, you would add menu links for each category.
This would enable your visitors to click on a category (a.k.a. theme, subject matter, topic, etc.) and view an archive page containing all the posts within that specific category.
This would enable you to do exactly what you’re describing.
Hope this helps!