1) Create content – some content type (Page – regular page content witch author ownership, Wiki – all group can manage and modify the content page)
Please use the Create content menu
2) Edit the content in source language.
3) Categorize it, set correct language, set audience, book outline for including the content to a book
4) After creating and saving click Translate on top
Open "Edit" most likely in new tab
"Add translation" for another language
5) Translate stuff and set all the attributes according to the original content (audience!!, book outline!!, except language – it’s already predetermined)
Well done – congratulation!