Why did Harry Potter throw the Resurrection Stone in the Forbidden Forest?

Because he knew he had to face the reality. Encouraged by his deceased relatives, he summoned up the courage to face Voldemort in the forbidden forest, that is, the courage to die. That is to say, to say the least, Harry doesn't know the fact that the Resurrection Stone can't be resurrected, so throwing it away can better show Harry's courage. The legend of the Resurrection Stone brings hope to others, but it can't satisfy others' hopes. Instead, it will make people indulge in their own fantasies.

In Harry Potter and the Philosopher's Stone, I wonder if fans still remember a magic mirror where they can see what they crave most. The magic of the mirror makes Harry see his "parents". They are only images, not real souls.

But it is this magical image that fascinates Harry, and eventually he gradually loses himself and gets lost in his "parents" image. Finally, Professor Dumbledore helped Harry out of the predicament, telling him that real life is just around the corner, not people or things that have been lost.

The philosopher's stone has the same function as this mirror, but as a legendary artifact, it is definitely more powerful. The magic of the Resurrection Stone is not a real resurrection, but allows you to summon someone you want to see and recall them from the underworld. The summoned person can only be seen by the user of the philosopher's stone, and can only appear in the form of a soul, without a real body.

Harry understood after the first magic mirror that the dead will never come back after all, and no powerful magic can bring people back to life, so after understanding the magic of the Resurrection Stone, Harry chose to give up the Resurrection Stone.