In the New editor you build a lesson by typing into a page and dropping things in as you go. The slash menu is how you insert anything.
Inserting something
Click into the page where you want it, type /, and pick from the menu. Typing after the slash filters the list.
The menu is grouped the way the product groups it:
AI: Ask AI.
Question blocks: Multiple Choice, Long Answer, Select All Correct, Match, True or False, Resequence.
Basic blocks: Text, headings, lists and the rest.
Media and more: Image, YouTube, Interactive visual, Document, Page, Link, Table, Math Block, Inline Math.
Callouts: Example, Key term, Tip, Warning, Note.
Filtering runs over the name and the description, so /mult finds Multiple Choice and /you finds YouTube.
The + button in the left margin of an empty line opens the same menu.