Who won the Oscar for Best Actor for 'King Richard'?

For which film did Rami Malek win the Oscar for Best Actor? Who won the Oscar for Best Actor for 'Joker'? For which film did Joaquin Phoenix win the Oscar for Best Actor? Who won the Oscar for Best Actor for 'The Father'? For which film did Will Smith win the Oscar for Best Actor? For which film did Brendan Fraser win the Oscar for Best Actor? Who won the Oscar for Best Actor for 'Oppenheimer'? For which film did Cillian Murphy win the Oscar for Best Actor?