Complete websites templates

Hello,

I really like the site templates that you offer, but I haven't figured out how to get templates for whole sites and not just pages.
Also, when you choose a page and you want to add blocks or other pages, how do you get just the templates corresponding to the original page you chose?

I've looked in the documentation to find out how to do this but I can't find anything.

Thank you for your help,
Geneviève