It was a good lecture that I did not feel difficult even though I was a student of a certain age. The instructor tried to explain it very easily overall and tried hard to make the diction accurate. The only regret was that the screen was too large to see the code when recording the video, and the question feedback was not satisfactory, so I gave it a score of one star. However, other than other environmental issues, it was great to lay the foundation for backtesting. I hope that in the future, you will develop content that provides good feedback in a more detailed video environment, and if the lecture is released, I will 100% teach it.