In order for you to properly comprehend any issue, I strive to explain its underlying principles. I oppose mindlessly memorization of formulas. Instead, I would rather impart to the pupils how to generate them and comprehend how to use them appropriately in various contexts. I always prepare the materials and the themes before a class. I will annotate a pdf on the computer screen throughout the class, and the student is also allowed to keep a copy of the materials. The pupils will also be suitably given homework each day to complete at their own pace.