Since I have been interested in Agile for quite a while now, I jumped at the opportunity to learn more about it when I noticed this Coursera course: "Getting Started: Agile Meets Design Thinking". It is part of a set of courses, called a Specialization, which tries to give "understanding and appreciation of the principles and practice of agile management".
I just watched the videos from the first week and I must say that I really like it. The instructor, Alex Cowan, does a great job of explaining the topics and, at least for me, his voice and way of presenting is pleasant to watch and listen to.
The one thing I am not so happy with is the fact that you cannot do the quizzes and assignments unless you pay. It is understandable that you have to pay to get an official certificate, I feel that blocking certain parts of the course is not a friendly incentive and that it actually conflicts with the free learning environment Coursera opts for. Furthermore, the price of this course (and the specialization) is really too high. If it was something in the order of 40 or 50 euros, I would seriously consider it (I really dig certificates!), but for me, 129 euros is way too expensive, especially if you want the whole specialization and you and up paying 621 euros...
If you don't know what Agile is, or simply want to know more, watching the videos of this course is completely free and I would recommend it.
UPDATE: If you cannot afford the cost of a certificate, you can always apply for financial aid, as kindly stated by the instructor in the comment below (with a link to more info).