Use these shortcuts in the rich text editor. Ctrl = Cmd, Alt = Option on Mac.
Headers
Ctrl+Alt+1
Heading 1
Ctrl+Alt+2
Heading 2
Ctrl+Alt+3
Heading 3
Formatting
Ctrl+B
Bold
Ctrl+I
Italic
Ctrl+U
Underline
Ctrl+Z
Undo
Ctrl+Shift+Z
Redo
Ctrl+K
Add link
Tab
Indent list
Shift+Tab
Outdent list
Toolbar
Use the toolbar for headings, font, size, bold, italic, colors, lists, link, image, video, and table. Use Clear formatting (eraser) to remove formatting including colors from selected text.