How the exams helps you know what kind of job you are doing as an instructor. You will be able to see what sections of the course you covered in an understandable way, and what sections need some additional presentation work on your part.

using variety in the slides, text followed by illustrations that way students have a visual interpretation of what you are explaining

The importance of field trips is that students can see how the jobs that they are going to school for are being applied in the real world.