There is nothing like a ‘dynamic static page’. You can have dynamic pages AND static pages. You can have upto 100 static pages on your site. But dynamic pages are unlimited and are generated automatically based on content in your database.
Dynamic pages are meant to be used where you’d have the layout of multiple pages remain the same, but the content is fetched from a CMS database and changes dynamically. So for each row in your database, you will have a dynamic page.
You can watch this webinar which will give you much more insight on using dynamic content to build your site:
In layman terms, a dynamic page is very similar to a static page, it’s just that you have the option to ‘link’ elements to a CMS database. So you can still have static content by very simply NOT linking them to your database.
But what you cannot do is change or modify the layout of a dynamic page. You can only modify the content of these elements.
Lets say you have a video for one item, and for the other item you have a gallery that’s linked to the slider, but no video. In this case - since the layout of the dynamic page will remain the same, your first dynamic page will still show a slider with default preloaded images, and your second dynamic page will also still show a video player element with a default video even if you haven’t added a video for that item in the CMS.
While this cannot be done natively, you can still use code to hide / show elements based on the data in your CMS, but that is a more advanced topic and you can have a read on that below if you are interested to learn more: