What is Laertes doing at line 202?

At line 202 in Shakespeare's "Hamlet," Laertes is preparing to leave for France, expressing his desire to return to his studies and distance himself from the turmoil in Denmark following his father's death. He is concerned for his sister Ophelia and warns her about getting too close to Hamlet, emphasizing the importance of guarding her heart. Laertes's actions reflect his protective nature and foreshadow the conflicts that will unfold as the play progresses.