What might you do in a typical first session with a student?

重要的是要获得一个understanding of the student's foundation in the subject area. I would assess the student's command of the current subject material, but I would also make sure that they have a strong foundation in the subject from prior classes before focusing solely on new topics.

If a student has difficulty learning a skill or concept, what would you do?

There is always more than one way to look at a concept, so I would adapt my teaching style to fit the needs of the student.

What techniques would you use to be sure that a student understands the material?

I believe that when a student can explain a topic (or their thought process in solving a problem), they have truly mastered the material.