Interior Book Design & Formatting is all about format, text fonts, white spaces, spacing, color, photographs or illustrations of a book.
Conversion refers to turning your formatted manuscript into an ebook file readable on multiple ebook reading devices, without editing or styling.
Common ebook formats include: EPUB, Kindle Format 8, MOBI.
Tip #1: POD providers have specific formatting requirements about the trim size, margins to pagination, photo resolution. First select a self-publishing service, then create a book's interior with those specifications in mind.