'48 project'

[Chibi-Chan]

Hi guys,

I desperately need a true fan of all this 48 groups because there are way too much groups and I don't get it at all.
Although I really like SDN48 I haven't understood more than that there is AKB48 and SDN48 (and SKE48?) and that SDN48 is more mature and an adult show.
Please tell me how much groups of this 48 thing are out there and what about their subgroups? And what is this theater thing, kind of a concert every week? And are AKB48 and SKE48 kind of one group or what? You see, I'm really confused... xD
(Oh my, and I thought Morning Musume with all the subgroups were confusing... lol)

If there is a already a thread like this, I'm sorry, but the search doesn't work for me... -.-