I have done tons of research on the JoJo's Bizarre Adventure story and I summarised it:
Part 1: Dio Brando
Part 2: Dio consequences
Part 3: DIO returns
Part 4: Dio consequences 2
Part 5: DIO's son
Part 6: DIO's boyfriend
Part 7: Dinosaur Dio and another Dio
Part 8: without Dio, for the moment.