For the text of the book, use the style called “Text body” in LibreOffice.
Using this style allows the reader to change the font according to his preferences.
- font size
- style: bold, italics
- horizontal alignment (left, center, right, justified)
- first line indent
- space above and below each paragraph
- drop caps
A style derived from "Text body" might be used for the first paragraph of the chapter,
for instance to remove indentation on the first line.