Kant "Cosmological"

Wow! So to me, i find Kant so difficult to read. I have no idea what he is trying to say half of the time. But as far as cosmological ideas go, correct me if im wrong, this is what i understood from it. Cosmogical ideas are the ideas about the world and universe. It is one of the arguments Kant uses against metaphysics. He says that every thesis has an antithesis ( kinda confused about this). Kant says that when the thesis is false, that means the same for the antithesis. In this book, he brings up four ideas/ thesis and along with them an antithesis. Whatever is held within space and time, is also held generally by the anti thesis. I just dont' understand this guy. AHHHH!!!!