What is the movie harry potter and the half-blood prince about? I really don't understand at all.

Well, Voldemort split his soul by killing people and built seven horcruxes to store pieces of his soul. Horcruxes are hard to destroy, and the evil curse of horcruxes can also hurt people. Dumbledore found a horcrux hidden by Voldemort, which is the ring. When he destroyed the ring, he was tempted and attacked by a horcrux, so that his life was not long. With Snape's help, Dumbledore can live for one year at most. Dumbledore is a clever man. He guessed that it was Voldemort's horcrux based on the original diary destroyed by Harry and this ring, but he didn't know how many horcruxes Voldemort had made. So he used the psychology that Slahorn, a professor of Potions, likes famous students to get Harry close to Slahorn, so as to set up Voldemort's and Slahorn's memory of horcrux dialogue. At the same time, Lao Deng himself was often absent from school because he was busy going out to find other people's memories and the whereabouts of other horcruxes. Harry found Malfoy sneaking around all the time, but he didn't know what he was doing and always wanted to find out. In fact, Malfoy accepted Voldemort's mission, killed Dumbledore and introduced the Death Eaters to the school. So Malfoy always tried to kill Dumbledore by various means, but he never succeeded. As soon as Deng got back to school, he would ask Harry to go to class and show Harry all the memories he had found about Voldemort. These memories are very helpful for finding Voldemort's horcrux. Harry's potions were originally poor, but he got a potions textbook belonging to the half-blood prince, which made his potions advance by leaps and bounds and won the love of Slahorn. Harry found that the half-blood prince not only had good potions, but also invented some small spells. One of them is a spell called "Invisibility of the Holy Front", which attracted Harry's attention because it was marked as being used on the enemy. Once Harry met Malfoy, and he angered Harry. Harry used a magic spell on Malfoy, and Malfoy's face split at once. Professor Snape arrived just in time and read a spell to save Malfoy. Dumbledore also knew that Malfoy was going to kill himself, but he also knew that Malfoy had not degenerated to the point of killing, so he secretly asked Snape to kill himself instead of Malfoy at a critical moment to gain Voldemort's trust. Harry finally got Slahorn's memory and knew that Voldemort had made seven horcruxes. Dumbledore also found another horcrux. He took Harry through a lot of hardships and finally got the horcrux, but Dumbledore was very weak because of drinking poison. When they got back to school, they saw the sign of the Death Eater rising in the tower. Because the death eater's sign will not be raised until the death eater kills, they quickly ran to the tower. In fact, Malfoy finally fixed the transmission cabinet so that the death eaters could enter the school unimpeded. Malfoy cast a spell on Dumbledore who was unprepared. At the last minute, Dumbledore put a curse on Harry hiding under the invisibility cloak, making Harry unable to move. Malfoy finally didn't have the courage to kill Lao Deng. Snape thought he killed Lao Deng. After Dumbledore's death, the spell he cast on Harry was useless. Harry and the arriving members of the Order of the Phoenix fought the Death Eaters. When Harry saw the Death Eaters retreating, he went after Snape. He cast a spell on Snape, but Snape turned around and told Harry that he was a half-blood prince. Snape and others escaped, and Harry returned to school and found that the horcrux was fake, but the real horcrux had been taken away by a man named R.A.B The following is the content of Harry 7: Harry and his friends are going to leave school to find and destroy other horcruxes. The half-blood prince and others fled back to Malfoy Manor and began to seize the power of the Ministry of Magic. Snape became the headmaster of Hogwarts and took control of the school. Voldemort took control of the Ministry of Magic, and Harry, Ron, Hermione and others began to flee. They began to look for Voldemort's remaining horcruxes. They fled to Sirius' home and unexpectedly found that this man named RAB was Sirius' younger brother. Through the narration of Kreacher, a house elf, they learned that the horcrux was stolen by Mundungus (a member of the Order of the Phoenix, a thief). Finally, they learn that the Horcrux (a Slytherin necklace) was sold by Mundungus to Umbridge (a teacher who once taught Harry defense against the dark arts, a very annoying woman). But their hiding place was exposed, and they could only wander around the world. They kept changing their camping places, but they couldn't find a way to destroy the horcrux. The horcrux was tempting the three of them at the same time, and Ron finally couldn't stand going home. Harry and Hermione learned from Sir Black's painting brought from Sirius' home that Dumbledore finally destroyed the ring with Gryffindor's sword (because Sir Black's other painting was in the principal's office, he could walk between the two paintings). Harry and Hermione are determined to find the sword. They went to Godric's Valley (where Harry was born and Dumbledore's hometown), but there they met Voldemort's snake, which was waiting for Harry. Harry lost his wand for this. They fled to a forest. Harry saw the silver patron saint of a doe. He followed him to a river. He saw that the bottom of the river was actually a Gryffindor sword. He went to the river to pick it up. At this time, the horcrux necklace suddenly caught him tightly and made him almost die. Ron saved him. It turned out that Ron regretted going home and wanted to come back. At this time, Dumbledore gave Ron the light-out device and brought Ron to Harry. The ignition device is actually a Hodge (a magical vehicle). Ron destroyed the horcrux necklace with his sword. They were accidentally caught. They caught Malfoy Manor. They met the goblin pull ring at Gringotts Bank and were arrested. Then they escaped with the help of the elf and fled to Ron's brother's shell hut. When they were in Malfoy Manor, lestrange, a loyal follower of Voldemort, was frightened and affectionate when he saw the sword, so it was speculated that Voldemort had something important in Gringotts lestrange's safe, probably a horcrux. So they exchanged swords and let them go to Gringotts lestrange's safe. Due to the betrayal of the goblin pull ring, they found the horcrux, but lost the sword, and they escaped from gringotts. At this time, Voldemort was very angry when he learned that his horcrux gold cup had been stolen. He wanted to make sure that his other horcruxes were safe. Because Harry and Voldemort's thoughts are interlinked, Harry knows that Voldemort's other horcrux (a crown) is hidden in the school, so they plan to sneak back to the school. With the help of Dumbledore's younger brother, the owner of the pig's head bar, they returned to the school's room of requirement through a secret passage, and were surprised to find that all the members of the original DA were there. If Harry wants to find a horcrux, he needs to know what it looks like first. They know that horcruxes are related to Ravenclaw, the founder of Ravenclaw College. With Luna's help, Harry knew it was a crown. But Harry was also exposed, and Snape and others discovered Harry. But Harry was protected by students and other justice teachers, and Professor McGonagall beat Professor Snape away. Ron and Hermione went to the chamber of secrets and destroyed the horcrux of the golden cup with the fangs of the basilisk. Harry found Hermione Ron, who knew that the crown was hidden in the room of requirement, and Harry had seen it when he was hiding the textbook of Half-Blood Prince. So they went to the room of requirement, and Malfoy and others followed. Malfoy's Crabbe used magic to light a fire and tried to burn Harry to death, but he failed to put it out. Finally, he was burned to death. Harry saved Malfoy with a broom, and the horcrux of the crown was destroyed by fire. At this time, only one horcrux was still around Voldemort, and that was the snake. He tried to find out in his mind that Voldemort was screaming in the shack, and the snake was beside him, so they went to the screaming shack. Unexpectedly, Voldemort happened to kill Professor Snape in order to seize the elder's wand. After Voldemort left, Harry and others ran to Snape, who gave Harry some memories. Harry ran back to the principal's office, and learned from Snape's memory that Snape was the undercover that Dumbledore planted beside Voldemort. Out of love for Harry's mother, Snape remained loyal to Lao Deng. Snape also put the sword into the river, because he listened to Sir Blake's portrait in the headmaster's office and said their address, so he used the patron saint to draw Harry out. His patron saint is also the patron saint of Harry's mother! Harry finally knows that he is also one of Voldemort's horcruxes. So Harry went to the forbidden forest to find Voldemort, ready to let Voldemort kill himself. On the way, he met Neville and told him that he must kill the snake. Harry found Voldemort, and Voldemort put a death curse on Harry. Harry fell, but so did Voldemort. Harry seems to have returned to King's Cross Station, where he met Dumbledore. Dumbledore explained many things to him, told Harry that the horcrux had been destroyed by the curse of death and told Harry to go back. Voldemort thought Harry was dead and asked Hagrid to take Harry's body back to school to show off. Neville crossed sorting hat, drew Gryffindor's sword and killed the snake. Harry jumped up to fight Voldemort again, but because Voldemort made a mistake, Snape's wand was not the elder's wand. In fact, Malfoy first defeated Lao Deng with the curse of taking your weapon, and Lao Deng's wand was transferred to Malfoy. Later, at Malfoy Manor, Harry defeated Malfoy again, and the elder wand was handed over to Harry. So when Harry confronts Voldemort, Voldemort's magic is bounced back, and the Elderberry wand will not cast a death curse on its owner. Voldemort is dead and the world is at peace. . . .