This post tests various embed blocks: The Common category includes the following blocks: Paragraph, image, headings, list, gallery, quote, audio, cover, video. The paragraph block is the default block type.  It should not have any alignment of any kind. It should just flow like

The shortcode widget: The Archive Widget: The same Archive widget but as a dropdown: The Category widget block has an additional option for showing category hierarchies: The Latest Comments widget can display or hide the avatars, the date, and the comment excerpt: Here is

The Layout Elements category includes the following blocks: Group, Button, Columns, Media & Text, separator, spacer, read more, and page break. This group block has a light green background color. The read more block should be right below this text, but only on list

The formatting category includes the following blocks: The classic block can have almost anything in it. a heading The custom HTML block lets you put HTML that isn’t configured like blocks in it. (this div has a width of 45%) The preformatted block.The Road