Back on the subject of OMM: I have a question that I just thought of.
Is OMM only applied to the spine/ribs? Or is it performed on other areas of the body? I read a mention in something about A.T. Still doing OMM on feet... but I don't know if that practice died out or what? I never hear about anything except spinal manipulation, but feet are also an area with a lot of joints that get a lot of stress, so it seems plausible.
No, OMT, which is actually used to describe a conglomeration of techniques and concepts, can be applied to areas other than spine/ribs. I think you are correct, though, that spinal manipulation is probably the most well-known and seen. In addition to spinal and rib OMT, you will also learn OMT to diagnose and treat other articular structures and their associated conditions, such as, yes, feet, hands, wrists, knees, elbows, innominates, sacrum, glenohumeral, radial/ulnar, tibial/fibular, etc. You'll see how structures relate to one another and how pathologies/somatic dysfunction in one area can impact others, for example, in short leg syndrome, and the osteopathic approach to diagnosing and treating these types of conditions. You'll also learn soft-tissue techniques and techniques to address lymphatics and maybe some of the other organ systems, too. If you buy into it, you'll also learn cranial techniques.
Eventually, if you get into an osteopathic medical school, you may be required to get the green FOM book, which, in my opinion, is a difficult read, but it does have many, if not most, of the techniques and theories outlined. I like
An Osteopathic Approach to Diagnosis and Treatment, by DiGiovanna, though. It's a better read.