There are two sets of layouts for displaying news or blog-like content in SharePoint: News Rollup and News Article, or News Rollup2 and News Article 2.
Each set of layouts offers a different experience. Both allow articles to be put into categories (and a single article can be in multiple categories). The available categories are managed at the root-level in View All Site Content, in the list called "SiteNewsCategories."
Which should you use?
See descriptions below to determine which set will fit your needs. You can not mix-and-match the rollups and articles (i.e. News Rollup with News Article2 or News Rollup2 with News Article).
The original News Rollup layout offers more of a blog-like look and feel. The rollup shows the full text and imagery of every article as the user scrolls down. There is a place to put introductory content or featured items at the top of the layout. At desktop view: On the left side of the page is a display of the Categories, and beneath that, a display of the Latest News. At mobile view: The Categories and Latest News are available via a button at the top of the rollup page.
The News Article layout offers a title field, date field, author field, categories and a content area. You can style the text in the main content area of the article just like you would any other page, and you can add images directly into the content.
News Rollup2 looks more like a regular page rollup with an automatically created list of thumbnail images, article titles and preview text under each title. There is a place to put introductory content or featured items at the top of the layout, as well as a field that allows you to set the number of characters of article text to display under each title. At desktop view: On the left side of the page is the regular left navigation display (which can be set to show only the subsite, its pages, or the above subsite that the current subsite is contained in — put in a TSC Ticket to have this changed), and beneath that, a display of the Categories. At mobile view: The navigation and Categories are available via a button at the top of the rollup page.
The News Article2 layout offers a title field, a sub-title field, author field, categories, and a content area. You can style the text in the main content area of the article just like you would any other page, and you can add images directly into the content. If there is an image in the article, you will have to make a thumbnail version of the image and upload it to the Rollup Info tab at the bottom of the page. (If you do not include an image, it will default to a standard gray university logo.) The thumbnail version of the image should be sized to exactly 120px by 120px. After you’ve resized the image, you’ll go to the bottom of the page, and click the Rollup Info tab (it’s next to the Page Info tab). Click Browse and then Upload to add the thumbnail image to the Images folder. If there are numerous images in the article, you only need to select one to crop and use as the thumbnail image.
Changing the layout of a page is easy — here's how: Changing a Page Layout.