I have great experience with Coursera learning all kind of topics in a structured and self-paced way. I finished these two courses and I found them to be helpful as an introduction to the world of AI/ML.
Google AI Essentials
Learn essential AI skills to advance your career
AI For Everyone
Learn the basics of AI and its impact on the world
DeepLearning.ai
In addition, there is DeepLearning which contains fresh AI courses that are more hands-on. Andrew is one of my favourite instructors. His teaching style and the way he explains things is calm, clear and simple.