Understanding the concepts behind derivation steps is more important than simply memorizing them for the Physics optional subject. Memorization may help in the short term to recall the steps during an exam, but it does not foster a deep understanding of the subject matter. On the other hand, focusing on understanding the concepts allows for a broader and more comprehensive understanding of the subject, which can be applied to a variety of problems and scenarios.

Benefits of understanding concepts:
- Flexibility: By understanding the concepts, one can apply them to different scenarios and solve problems that may have variations or modifications. This flexibility allows for a deeper understanding of the subject matter and the ability to tackle complex problems that may not have been explicitly covered in textbooks or lecture notes.
- Problem-solving skills: Understanding the concepts behind the derivation steps helps develop problem-solving skills. When faced with a new problem, one can analyze it, identify the relevant concepts, and apply the appropriate principles to derive the solution. This analytical approach is crucial for success in the Physics optional subject.
- Comprehension: Understanding the concepts provides a comprehensive view of the subject matter. It allows for a deeper comprehension of the underlying principles and laws that govern the phenomena being studied. This comprehension is not limited to a specific set of derivation steps but extends to a broader understanding of the subject as a whole.
- Long-term retention: Memorization may lead to short-term retention of information, but understanding the concepts leads to long-term retention. By comprehending the underlying principles, one can build a solid foundation of knowledge that lasts beyond the immediate needs of an exam. This knowledge can be further enhanced and built upon in future studies or professional endeavors.

How to focus on understanding:
- Read textbooks and reference materials: Read the textbooks and reference materials thoroughly to gain a clear understanding of the concepts and principles. Take the time to comprehend the explanations and examples provided.
- Ask questions: If something is not clear, do not hesitate to ask questions. Seek clarification from teachers, classmates, or online forums to ensure a comprehensive understanding of the subject matter.
- Practice problem-solving: Solve a variety of problems that require the application of the concepts. This will help solidify the understanding and develop problem-solving skills.
- Visualize and relate: Visualize the concepts and try to relate them to real-life examples or phenomena. This will help in understanding the practical applications of the subject matter and enhance comprehension.

In conclusion, focusing on understanding the concepts behind derivation steps is more beneficial in the long run than simply memorizing them. It allows for flexibility, problem-solving skills, comprehensive comprehension, and long-term retention of knowledge. By following the suggested strategies, one can develop a deep understanding of the subject, which is crucial for success in the Physics optional subject.