@smith_catrina_r
A shell is normally a holder for content. Think of mollusks or crustaceans. It's a place for the animal to live. It's not the animal itself, just the place it lives.
A page shell should be a page for content to live, without actually having content on it. I say should because I'm not the person assigning this, but that's what I would take it to be. They may want more, so I would check with them for clarification.
This sounds like a project I had my students work on a couple of years ago. They were supposed to redesign our statistics course within Canvas. For some, that included modules, but they were free to use a content page as a home page if they liked.
I told them that in the modules, they needed to create links to the pages that they were going to have and that they had to fill out a couple of pages, but the rest of the pages could be empty -- they just had to exist.
I think that's empty content page is a page shell. But you should really check with the person who assigned you to do this. Some may want you to put a blank page, others may want you to put in the headings without the text, and others may want you to use lorem-ipsum or some other content generator so there are meaningless words on the page.
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