I have completed both of the following: 1) https://www.coursera.org/learn/learning-how-to-learn 2) https://www.coursera.org/learn/machine-learning I highly recommend both of them, if they cover a subject you're interested in, though if you only have time for one, they are listed in descending priority order. Given how low it's time+energy requirements are, and how large the pay-off has been, I recommend Learning How…
I did Learning How To Learn twice and I still not sure how helpful it is. The only thing I found useful/applicable is spaced repetition. What part of the course do you feel it's valuable? I don't mind going back to do it again.
I also found the working memory, and memory information in general very informative and helpful.