Hi,
I don’t see here any other topic from you, so something went wrong.
Well regarding the product slider, that only works with variable products and you to add images to each product variation so it can slide between the different images.
Regarding the templates, what you are you showing us is the SPB Sections that is different from a page template. The difference is that you can edit an SPB Section and those changes will reflect in the pages where you used that SPB Section.
When you use a page template(option in the page builder) it just add’s a block of content to the current page.
This is the page templates
-Rui