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The / menu is the quickest way to add anything to your post, without reaching for your mouse.
On an empty line, type /. A menu opens with everything you can add:
Keep typing after the / to filter the list. For example:
Use one word to search. A search with a space in it will not find anything.
Use the up and down arrow keys to move through the list and press Enter to add the highlighted item. To close the menu without adding anything, press Esc or delete the /.
Click the + button (Insert block) in the toolbar at the bottom of the editor. It has the most common blocks: Horizontal rule, Image, Inline image, Table, Collapsible, Tweet, YouTube video, and Insert space above.
Tip: Insert space above adds an empty line above the block you are in. It is handy when you need to add something before an image or table at the top of your post.