"Forget" about indentaition. You should still write beautiful code, but if you mess up with tabs/spaces, or copy one piece of code to another that uses a different indentation style, it won't break.

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I ...

Please check your python version with the following command. The result should be between 3.8 and 3.14.