What should I know about crane hand signals as an apprentice?
Treat crane signals as awareness unless you are the qualified signal person. Know that STOP matters, only the assigned signal person controls the operator, and emergency stop/safety concerns override ego.
High-risk starter answer - crane signals are qualified-person work. Learn who the signal person is and stay out of the way unless you are assigned and qualified. The apprentice move is to recognize the chain of command, not freestyle hand signals because you think you know what the operator needs.