How did Harry Potter get his lightning bolt scar?

Voldemort killed Harry Potter's parents. Before they were murdered, his mother sacrificed and wanted to be killed first when she begged for Harry's life and Voldemort killed them. After killing Harry's parents, Voldemort tried to kill Harry, not realizing love, he did the killing course. Voldemort's course rebounded because of Lily Potter's love and sacrifice for Harry, therefor, Voldemort lost all his powers and Harry only escaped with one scar.