If the ranger chooses humanoids or outsiders to be a favored enemy, he have to also pick an associated subtype, as indicated over the table. If a certain creature falls into multiple group of favored enemy, the ranger's bonuses don't stack; he only makes use of whichever bonus is higher. https://dungeondragonsranger83715.ampblogs.com/Dungeon-Dragons-Ranger-An-Overview-48449801