There’s all kinds of randomizers. There’s ones called “no logic” where anything can be placed anywhere and it can be unbeatable if you don’t know the ins-and-outs of all kinds of glitches and bypasses. On the flip side, there are beginner friendly randomizers that keep items “in logic,” wherein items can never be placed behind a check you cannot pass (e.g., the hookshot will never be in a place you need the hookshot to get to).