Here is a link to my original "regular" granny square tutorial - ... And here is one showing the "join as you go" method for connecting granny squares - ...
by Crochet Jewel
by Kerri's Crochet
by Limlenn crochet
by Sabrina Sun
by Sheruknittingcom
by NotikaLand crochet and knitting
by Aunt Johanne