When Wanda Maximoff became the Scarlet Witch, she asserted herself as one of the most powerful characters in the MCU, but there were several moments that defined the character. In the comics, Wanda Maximoff has a long and complex history, where its revealed that her father was Magneto. While in the MCU, the character has been given a slightly different origin story, she has built up a personal history after appearing in numerous projects since 2015 in Avengers: Age of Ultron.
https://screenrant.com/scarlet-witch-scenes-defined-mcu-timeline/