How can we do a good tutor/teacher?

I have some good friend as a professional teacher who teach school in China ,I know befor they go to the class,they will make sure whether their clothes is good,and make sure whether they have a good mood for the students.
it is some details for a teacher.they think do a teacher is a very seriousness thing.
now I want to discuss the thing:what shall we do as a tutor?
yesterday ,a man book my lession ,we chat very happy,but in the end I find my powgramo didn’t work.if I prepared very well ,this thing won’t be happen .so I hope as a teacher,we must do it better and better.and then as a student we can study better and better.

The student matters much more than the teacher. The teacher inspires, encourages and supports. The student learns.