Machine Learning Specialization ↗
Free to audit on Coursera; $49/mo for certificate
Prerequisites: Basic Python, high school math
modelsAndrew Ng’s updated Machine Learning course with Stanford — the modern successor to the original Coursera ML course that launched the online AI education movement. Three courses covering supervised learning, advanced algorithms, and unsupervised learning using Python and TensorFlow. The most rigorous free ML foundation available, with the Stanford brand adding credential weight. If you want one certification that signals ML competence, this is it.