Final answer:
Ophelia warns Laertes against trusting false friends in Act 1 Scene 3 of Hamlet.
Step-by-step explanation:
Ophelia warns Laertes against trusting false friends in Act 1 Scene 3 of Hamlet. She advises him to be cautious and not to rely on people who may pretend to be his friends but have ulterior motives. Laertes should be wary of those who might deceive him and manipulate his trust.