How did Harry Potter almost die?

Answer 1

When Severus Snape is dying, he gives his memories to Harry so that he has all the information he needs. Harry watches them and discovers that Snape was in love with his mother and that when he realised Lord Voldemort planned to kill her, he went to Albus Dumbledore and told him that the Potter's were in danger so that he could protect them - he also begged Voldemort to let Lily survive.

Dumbledore agreed to protect the Potter's if Snape would pretend to be a death eater, spying on the order when in actual fact, he was an order member pretending to be a death eater who was spying on the order.

After Lily's death, Snape agreed to help keep Harry alive even if he hated him. When Dumbledore found out he would die within a year, he told Snape that he must be the one to kill him. Snape was also tasked with telling Harry that for Voldemort to die, Harry had to die.

After hearing this, Harry went to Voldemort and allowed himself to be hit by the killing curse, accepting his fate. However, he does not die because the killing curse only killed the part of Voldemort's soul that was inside Harry.

This allowed Harry to return to the battle and because all his Horcruxes has been destroyed, Voldemort could now die.

Answer 2

In Harry Potter and the Half-Blood Prince, the sixth book, Ron is almost poisoned but Harry saves his life by giving him a bezoar. Go, Harry! Whoo whoo!