is the monster blind or not?
cause the tip in the first room has not helped, it still finds me, no matter what
Monster in not blind. It just can't see a lot and mainly focuses on its hearing.
Although, the monster can still see you standing, say, on the other side of a hallway.
I think the stealth mechanic here works similar to Bethesda games. If you crouch, the monster can't hear you. But if it sees you crouching, it spots you.
Or you can just forget about being cautious and run the entire time as you mentioned.