As a teaching assistant (TA), you will have opportunities to learn about the inner structure and functioning of being an instructor. Teaching assistantships are supervised by a faculty member and allow students to get some teaching experience and in some cases performs many of the tasks typically performed by graduate students, including, preparing for class, one-on-one instruction, grading and proctoring exams. Moreover, you will have an opportunity to experience different instructional styles, as all instructors have a teaching philosophy and style of their own. Beyond the experiences in the classroom, as a TA you will have an opportunity to form a relationship with a professor who teaches in an area of your interest.
If you have done well in a course, consider serving as a TA for that course in subsequent years. You could be a TA for a faculty member or a graduate student. To become a TA, contact individual course instructors.