One highly recommended free resource for learning machine learning from scratch is the Machine Learning Crash Course offered by Google for Developers. This is a fast-paced, practical introduction to machine learning that features video lectures, real-world case studies, and hands-on practice exercises. The course covers a range of topics, including supervised learning, neural networks, and deep learning. It also provides an overview of TensorFlow, Google's open-source library for machine learning.
Another excellent resource for learning machine learning is the Introduction to Machine Learning course offered by MIT OpenCourseWare. This course introduces the principles, algorithms, and applications of machine learning from the perspective of modeling and prediction. It covers concepts such as the formulation of learning problems, representation, overfitting, and generalization. The course includes both supervised learning and reinforcement learning, with applications to images and temporal sequences. This resource is a great choice for those who are looking for a comprehensive and in-depth introduction to machine learning.