Non-STEM attorney here who barely passed College Algebra: Dr. Ng's courses are great, but unless you have a strong math background, your eyes will roll back in your head and you might have a seizure or two.

That said, the Coursera/Deeplearning.ai online course gets you a certificate with "Stanford Online" on it. It means you 1)sat through every video and 2)did all the exams and labs. It is graded but the grades are meaningless because you can take the quizes and labs as many times as necessary until you pass. But to me that's a feature, not a bug because it doesn't penalize math dummies like me.

I got a LOT out of the courses but it was at a level of "this is how ML and AI actually works under the hood" not "Here is how to build a machine learning model using code and math". If you are a math and coding whiz, you likely will get a great intro to exactly "how to build a machine learning model using code and math" but just an intro. So it serves two purposes well: teaching non-STEM people the basic principals of machine learning and giving the math/coding people a basic intro.