What do Laertes and Polonius advise Ophelia to do?

Answer 1

In Act 1 Scene 3 of Hamlet, both Laertes and Polonius advice Ophelia to stop seeing Hamlet in a romantic way. Laertes, as Ophelia's brother, gives the explanation that Hamlet, as heir to the throne of Denmark, must ultimately do what benefits the country. That means that though he may love Ophelia now, he will never be able to marry her because she is not of royal blood so it would not reflect well on the country, and because Denmark must come first, their relationship is doomed to end. Laertes says that Hamlet's affections for Ophelia are essentially flirtation and are going nowhere.

Polonius, Ophelia's father, gives the same advice for a different reason. He basically says that Hamlet is a young guy and offers her affection because he wants her, not because he loves her. He advises that Ophelia value herself more highly than Hamlet will, and says she should stop seeing him because what she thinks is love is simply lust.
Stay away from Hamlet. Do not be childish. This is not love between you and Hamlet, it is called lust.

Answer 2

Polonius tells Ophelia not to believe Hamlet's promises of love. He tells her that Hamlet is not interested in her really, and just wants to take advantage of her. Therefore he tells her to send all his gifts back to him and refuse to have anything more to do with him.

Answer 3

Polonius urges Gertrude to be harsh with Hamlet when he arrives

Answer 4

He tells her to give Hamlet the cold shoulder, not to return his e-mails and send back his gifts.

Answer 5

He tells her to give him the cold shoulder.