Menahot 3: Torat Ha-Minhah, the Law of the Grain-Offering

Where are the most sacred offerings brought? And the less sacred offerings? That is, the northern and southern parts of the Temple courtyard, respectively. And what happens if the offering were brought in the wrong part of the courtyard? Also, what happens if one's intent is not for a grain-offering, but an animal sacrifice, for example? Or not for the right grain-offering? Intent is evident in the different kind of grain-offerings produced (fried, fluffy dough, etc.). And yet, the evident wrong-intent rarely invalidates the grain-offering. Why?