All goose is made of goose, just like all chicken tastes like chicken.
It is similar to roasting a turkey, yet rather different, too. The meat is dark, like duck. The flavor is rich and filling; unlike turkey which only tastes like the gravy you put on it. The goose carcass is much longer than a turkey, with a smaller breast. So you are carving the meat off the whole torso, rather than just cutting into the breast meat.
You can roast them like you would a turkey. But, use a meat thermometer. Since the meat isn't as thick, you can quickly overcook them.
You can also go crazy in the kitchen, like we do. Last year we confit'd the legs. We cut off the neck, stuffed it with pork sausage meat and the organs, then confit'd it in the goose fat and some of our homemade lard. We then just roasted the torso. So we had three great dishes using just the one beast.
And if I didn't mention it, get a meat thermometer.