Include a Table of Contents but do not show page numbers in Table of Contents since e-books don't have fixed pages.
Use proper heading hierarchy - Use Heading 1 style for top-level headings like chapter heading, Heading 2 style for second-level heading, and so on.
Do not use font colors since the e-book needs to support all reading modes - day, sepia, and night (dark) mode.
All text content needs to be in Unicode.
Use a single-column layout. E-books are intended to be read also on small devices. Do not align images and text in a single horizontal space.
Submit the file with the extension .docx.