Why is my content invisible
Make sure to publish your content and remove all group restrictions.
Why is no article present
The category you are browsing is empty and does have no articles.
How do I shorten articles
You can use a document break to achieve this. Learn more about content publishing.
How do I enable comments
Enable comments for your article inside the customize tab.
How should I use extras
You can render extras beside the contents block, therefore it typically is used for a sidebar or navigation. Another powerful feature is to unpublish a single extra and render it like a partial inside your template. Learn more about template-markup.
How do I create pages
There is no such content type. Create an uncategorized article and browse it under.