I was searching about how can I learn AI/ML -self learning , so I discovered that it will take seriously large amount of time, So I want to know if it is worth it to learn it from MIT free resources and andrew ng courses and lex Fridman, Or should I wait and get cs degree and maybe a phd in ml, or should I choose different field, I am still young but I have some programming experience in web and python, so what should I do ?