Hi Jarek,
it depends on what do you plan to do with Fog. Currently there are
mostly outdated tutorials which should be corrected some day, but I'm
not doing that because API still changes and it's better to rewrite
the tutorials/write new ones after the API is stabilized.
If you want to use Fog in a product or you feel to join the
development then I would consider helping you by writing some basic
docs.
Any specific part of Fog you are interested in?
Best
Petr