Creating New Page Using Hpstr Skeleton

I am at lost creating a new page using Hpstr. My other site, I simply created a 'new.html.twig' in the templates folder, 'new' folder and 'new.md' within it in the pages folder. However, this is not the case with this skeleton.

Do you mean a new blog post or a new top-level page? I've done the former by creating a folder in posts and then within that creating a .md file named post.md. You can view my HPSTR pages folder on GitHub at https://github.com/hibbitts-design/hibbitts-design-org-blog

A new top-level page. Not a blog post.

I've not done that myself... likely would require customization of the navigation.html.twig file. I'd also suggest you set up an inherited theme to keep changes if the original HPSTR theme is updated: https://learn.getgrav.org/themes/customization#theme-inheritance