A simple content block
This can be added to the page header, body, or footer. A fairly simple content block, there are fields for a heading, subheading, icon, and lead paragraph. Each of these can be toggled within the content block, to make it more flexible. There is no visual editor for these fields, but simple HTML can be added as necessary. For instance, <em> tags around a word for emphasis. This content block is often used in these codex pages to introduce and explain the content blocks being demonstrated.
Lead paragraph. Now you know!