The Block Editor is our new way of adding simple text and images. It has a toolbox for formatting your text with headers, bold, italics, and more. It also has simple editors to add links and images. You can see the styles and images right in the CMS.
You can access a Block Editor anywhere you type in text. Just click on the expander icon to the right of the field. For example, add or edit a Block and you'll see an expander icon next to the "Block Copy" field. Click on it to edit that text in the Block Editor.