Heart disease classification capstone: feedback on preprocessing, evaluation, and leakage [P]

I took a machine learning and Ai program not to long ago. My professor never really gave me a review what I did right or wrong. Can you guys take a look at my notebook and see what I could improve? Thanks

https://github.com/salorozco/machine-learning-and-artificial-intelligence/blob/main/heart/heart_capstone.ipynb