I just started learning to use Scribus in February 2016. My learning style is to jump in and try to do the job I need to do, rather than spend a lot of time going through a structured course.
I am finding this documentation isn't terribly helpful in this respect, particularly with regard to searching for basic concepts used in the application. My plan is to begin adding individual pages for each menu item, task etc as I figure out how to use them, particularly the less intuitive ones that I have found difficult to use myself. I shall also try to add wikilinks to connect pages and make them more useful.
Feel free to leave comments for me on my Discussion page.