You can choose any person from history to teach you any topic you want. Who’s your teacher, and what do they teach you?
This one is easy: Jesus of Nazareth is my dream teacher. I would ask Him to teach me how to love God and my neighbour sincerely and in an effectively way and how to be a better person every day in the middle of my circumstances and the problems of current life. I would ask Him to teach me to solve each of my existential doubts and troubles. But most important of all what I already said: I would ask Him to teach me how to love others as they need to be loved.