I don't know much about Coursera, but Udemy has always been quite bad since I remember.

Most drawing/painting courses are taught from people who are juniors at best. The quality is laughable compared to what you can get for free from Marco Bucci/Sinix/Proko channels. And honestly, even those high-quality videos won't teach you how to draw anyway.

That being said, I didn't realize how bad Udemy art courses were when I got started. I think that's a life lesson for me especially in the era of LLM.