Which manager won three World Series with the San Francisco Giants?

Which manager led the Red Sox to their 2004 championship? Which manager led the Cubs to their 2016 championship? Which manager has led the Dodgers to World Series titles in 2020 and 2024? Which manager led the Texas Rangers to the 2023 title, his fourth championship? Which manager led the Houston Astros to the 2022 title at age 73? What does it mean when a team "clinches" in baseball? What is the "Fall Classic"? What is the name of the MLB championship series that determines the American League pennant winner?