There are numerous online courses available for learning artificial intelligence (AI), and the best course for you will depend on your background, learning preferences, and goals. Here are some highly regarded online courses for AI:

1. “Machine Learning” by Andrew Ng on Coursera: This course is often recommended as a starting point for beginners. Andrew Ng, a renowned AI researcher, covers the fundamental concepts and algorithms of machine learning in a clear and accessible manner.

1. “Deep Learning Specialization” by Andrew Ng on Coursera: This specialization consists of five courses that delve deeper into neural networks, deep learning, and related topics. It offers hands-on programming assignments and covers the practical aspects of building AI models.

1. “Artificial Intelligence” by Sebastian Thrun and Peter Norvig on Udacity: This course provides a comprehensive introduction to AI, covering topics such as search algorithms, probability, machine learning, and robotics. Sebastian Thrun and Peter Norvig are pioneers in the field of AI.

1. “Fast.ai” courses: Fast.ai offers practical and cutting-edge courses on deep learning and AI. Their courses focus on hands-on coding and real-world applications, making them suitable for practitioners who want to apply AI techniques in practice.

1. “Introduction to Artificial Intelligence with Python” on edX: This course, offered by IBM, provides an introduction to AI using Python. It covers various AI techniques, including machine learning, natural language processing, and computer vision.

1. “Reinforcement Learning” by David Silver on YouTube: David Silver, a leading researcher in reinforcement learning, has a series of video lectures on YouTube that provide a comprehensive introduction to this subfield of AI.

Remember, AI is a vast field with various subdomains, such as machine learning, deep learning, natural language processing, computer vision, and robotics. Consider your specific interests and goals within AI when choosing a course. Additionally, exploring books, research papers, and practical projects can also enhance your understanding and skills in AI.