How to rewrite the notebook?

Hi everyone, I have finished watching the videos of part 1 once, and I begin to watch the videos again and try to write the code this time. I believe one of the best way to understand the methods is to implement them by myself, so I mimic the notebook in this course to write my codes, but I still can’t rewrite these great notebooks without peeking at them, would you like to share the ideas of how to do that?

Thank you very much!:thinking: