The WordPress editor organizes content into blocks representing different content types. The default block is the paragraph. When you create a new post, enter the title, and hit ENTER, and start typing in the main content area of the editor, you are creating paragraph blocks.
To add other types of blocks, click the + button (appears both at the top of the page and in the left hand margin when you add a blank line).
Clicking that button allows you to pick from the list of all available blocks. You can narrow down the list using a search function built into the editor. For example, if you enter “image” into the insert blocks tool, you find not only the basic “image” block but also the “gallery” block and other variations.
Part of the point of the different blocks includes controls specific to that content format. The blocks for agenda roles and content used in the WordPress for Toastmasters agenda editor take advantage of this same concept. For example, the blocks for paragraph and heading include some of the same text controls (bold, italic, and link), but the heading block lets you choose the heading level. Similarly, an image block would let you size the image and add a caption.
Some blocks, including paragraph and heading, include a transform button, which will be the first button on the formatting bar. Hover your mouse over it to see the options you can choose from. For example, if you typed in a paragraph but now want to display it as a heading or the first item in a list click the appropriate Transform To: choice.
Shortcut for adding blocks: If you know the name of the block type you want to add, enter the “/” character at the beginning of a line and start typing the name. After you’ve entered the first few letters, you should see an option to choose a block type. Click the one you want.