Beginner help topics are listed in recommended order of completion.

The URL tree where you can see all the URLs on your site and manipulate how things look. 

The block library is where all of the blocks you are using on your site live. You can also create new blocks from a template here. 

Query rules control what content gets pulled into a block. Query rules operate on an inclusion/exclusion basis. 

Sorting rules control what order content gets pulled in once the Query rules have been satisfied. Sorting rules operate on an inclusion/exclusion basis. 

The Links tab is used to generate other links inside the block. The primary example is to link off to subsection pages like news/local and news/world. 

Inside the Widget tab you will find an embed code that you can use or distribute to place an iframe of this block's content onto another site, usually a sister site.

Page customizations are similar to Block template customizations, except instead of being block by block, they are page by page. They are also employed on a per-URL basis, meaning that changes will follow the inheritance principle. In addition, several URLs will have customizations that are …

In the event that you want to preview an ad that you have placed on your site, as opposed to the grey Ad information, you will need to use the debug tool. This will work to show previews of both ads in fixed positions and those that are block-based. 

The CSS class field can be used to make a block visible or hidden based on a device's view size (desktop, tablet, phone). This is useful for large blocks (like a slideshow, a leaderboard ad block, etc.) where they won't fit width-wise on a phone, so you can use a CSS class to make the block visible on large sizes, or hide the block on small sizes.