The new lesson experience gives you two ways to insert anything that isn't plain text. Both pull from the same catalogue of blocks.
The slash menu
Type / on an empty line. A menu opens with every block grouped by type.
Keep typing to filter. Matching runs across both the name and the description of every block, so /mult finds Multiple Choice, /you finds YouTube, /sel finds Select All Correct and /tab finds Table. Handy one to know: /free finds Long Answer, because Long Answer is the free-form text question.
Arrow keys move through the list, Enter inserts the highlighted option, Escape closes the menu.
The slash menu is the fastest way to work if your hands are already on the keyboard.
The plus menu
Hover over the left margin of any block and a + button appears. Click it to open the same menu in a clickable form, with previews for each block type.
Same options as the slash menu. Use this one when you'd rather scan than type.
What you can insert
Text: plain text, headings (H1 to H4), bullet list, ordered list, blockquote, code block, divider
Media and files: image, video, YouTube video, table, interactive visual, document attachment
Links: a link to another page in this lesson, or an external link including Google Docs
Maths: a display maths block, or inline maths inside a line of text
Questions: Multiple Choice, Long Answer, Select All Correct, Match, True or False, Resequence
Callouts: Example, Key term, Tip, Warning, Note
AI: Ask AI, the inline composer
Two things worth knowing if you are moving over from the legacy editor. There is no separate Free Response block: short answers and extended answers both use Long Answer, and the mark scheme is what makes a question short. There is no separate Reflection block either: an ungraded prompt is a Long Answer set to 0 marks. See Asking for short answers in a lesson and Adding a reflection prompt to a lesson.
For step-by-step on individual block types, see the other articles in this section.