It's some kind of community website and at the main site I want to have
different boxes with information from differen models -> new users, new
news, etc.
How to set up? Do I need to render partials in each div, therefore I
need to set instances, do I?
In fact it's nothing more than requesting one controller (at index_url)
with some models?
In the view it's a matter of taste if you write a different partial
for each box or not. I would most likely do it, or reuse some other
partials for displaying users or new, that are already written.