So if I want a different template for that page I have to create a post-TEMPLATE_SLUG.hbs
Basically I can’t create a new page such as the frontpage and render it?
You can create a post-template with a similar structure as the index.hbs file, but just copying the content of the index.hbs won’t help, the post template has its own handlebars tags https://getpublii.com/dev/post-page-tags/
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