Element #7 of a book that is ready for self-publishing:
[ Correct formatting for digital or paper publication ]
Formatting and requirements vary across platforms, for example:
Page size, indentations, paragraph and page breaks, file type, etc. They also vary depending on whether you want to publish in digital or paperback or both.
Popular platforms that publish eBooks include:
One popular platform that solely publishes paperbacks:
Two platforms that publish both eBooks and printed books are: