The best free AI courses and certificates for upskilling in 2026 - and I've tried them all

I've worked with AI for decades and have a master's degree in education. Here are the top free AI courses online that I recommend - and why.
IEEE

Model-Free End-to-End Deep Learning of Joint Geometric and Probabilistic Shaping for Optical Fiber Communication in IM/DD System

Abstract: The application of neural network (NN)-based autoencoders in end-to-end (E2E) optimized communication systems has significantly improved performance. Autoencoders offer automated ...