How did Dick Grayson become Robin?

Dick Grayson was a young circus aerialist and the youngest member of the "Flying Graysons" family. His life changed after he witnessed his parents plunge to their deaths during a sabotaged trapeze performance.12

This tragedy was also observed by the wealthy socialite Bruce Wayne, who had experienced a similar loss of his own parents as a child. Recognizing a shared trauma, Wayne took the young boy under his wing as his ward. After months of rigorous training in the Batcave, Wayne—acting as his alter ego, Batman—trained Grayson to become his crime-fighting partner, Robin, the Boy Wonder.231