Different types of aggression in dogs. So many websites. What is right?

Social aggression would fit into the category of either fear or possession so either 1 or 2. It depends on the dogs so there has to be all those different types. The 2 you have are the main ones the the rest are other types that fit into the larger category's. So there may be a lot, like possession.Territorial,and food may all fit into one category. Im not sure what your asking but as far as I know they way to shorten the list is to combine them into larger category's.