A background in probability is useful when using machine learning in Python. I would recommend this playlist https://www.youtube.com/playlist?list=PLblh5JKOoLUIcdlgu78MnlATeyx4cEVeR
You can make money from completing https://www.kaggle.com/
https://medium.com/@laraib.sidd7/what-is-machine-learning-and-what-things-you-should-know-about-it-fa63bf080442