The UI Split block is designed to split the screen into two halves for responsive design.
The UI Grid block is used to created columns of content that resize and stack automatically.
The UI Cards block is designed to create boxed content that automatically resizes and stacks for responsive design.
The UI Tabs block is used to create tabbed content. A great way to keep from having to scroll so much.
The UI Segment block is used to create boxes, with margin and padding around content as well as formatting options for the contained content.
The UI Message block is used to create boxed content that can be colorized and other options to make a message stand out.
The UI Header block is used to create a constant looking header across the site. Options allow for a wide variety of looks.
The UI Image block provides options that work well with the Semantic UI based site design.
The UI Button block is used to create a link that looks like a button. There are tons of Semantic UI look and feel options.
The UI Container block is useful to group content and provides some formatting options for content such as link formatting.
The UI Bullets block provides extra formatting options for the bullet list, such as color and icon.
The UI Image List block provides a way to have a list with a different image on the side that will also stack for mobile.