There are several reputable online courses available to learn AI, each with its own strengths and suitability depending on your background and learning preferences. Here are some popular options:

1. “Deep Learning Specialization” by deeplearning.ai (Coursera): This specialization, offered by Andrew Ng, is highly regarded and covers essential topics in deep learning. It consists of five courses that progressively delve into neural networks, convolutional networks, recurrent networks, and more.

1. “Artificial Intelligence A-Z™: Learn How To Build An AI” (Udemy): This course provides a broad introduction to AI, including both theory and practical implementation. It covers topics such as machine learning, natural language processing, and computer vision.

1. “Machine Learning” by Stanford University (Coursera): This course, taught by Andrew Ng, is one of the most popular and comprehensive introductions to machine learning. It covers fundamental algorithms and concepts, such as linear regression, logistic regression, neural networks, and support vector machines.

1. “Introduction to Artificial Intelligence with Python” (Udacity): This course offers a practical introduction to AI using Python. It covers foundational topics like search algorithms, constraint satisfaction problems, and game-playing agents.

1. “Applied Data Science with Python” Specialization (Coursera): This specialization, offered by the University of Michigan, provides a comprehensive understanding of data science and its applications. It covers machine learning, text mining, social network analysis, and more.

1. “Machine Learning Foundations” by Kaggle: Kaggle is a popular platform for data science competitions, and they offer a set of free courses to learn machine learning foundations. The courses cover topics like data cleaning, data visualization, and basic machine learning algorithms.

Remember, the “best” course for you will depend on your background, prior knowledge, and specific interests within AI. It’s beneficial to review the course syllabus, read reviews, and consider the teaching style and materials provided to find the course that aligns with your learning goals and preferences.