Defint in which parts you want to organize your book, didactiv unit, etc.
Define what each part will contain: text, exercises, links, ...
Create the table of contents of your material
The contents will be immediately organized, following the defined structure
Edit the texts of the different sections.
Enrich them with multimedia elements, notes, reminders, definitions,...
Add activities (test, match exercises, short answer exercises, etc), glossaries of definitions, link sections, interactive scenarios...
Choose an style and change them whenever you want to obtain different presentations of your material.
If you want to create your own style, you can also do it!
Once you have elaborated the content, it is time for seeing the result.
Export it to the format you need: HTML, SCORM, ePUB, PDF...