AI is a must-learn skill today and you don't need a PhD to start with it.
Understand the differences between AI, Machine Learning (ML), and Deep Learning.
Learn Python as it is the go-to language for AI; free resources include freeCodeCamp and Codecademy.
Focus on learning Math (Linear Algebra, Probability, Basic Calculus), then move on to Machine Learning using resources like Andrew Ng's course and tools like Jupyter Notebook.