I general, I can recommend this course.
I was able to learn the basics of Julia language.
The three things that stand out for me are:
Data structures, Plotting, Data Frames.
Parallel computing is not part of this course.
There are a few weaknesses in this course, but it seems that the course is being reviewed frequently, in order to adress issues, and enhance the content.
Weaknesses I found were:
Some typos and dead links in tests
In some tests, correct answers (when the code works in the computer language) are graded as incorrect, because the grading software only accepts one correct answer, rather than a variety of correct answers.
Some tests are testing your ability to pay attention in small details, rather than your ability to understand the computer language
There are not enough participants in the course for mutual grading to work properly. Instead instructors have to do grading, which often occurs with a delay of a few days.
I suggest that the course material should give more references to side information (e.g. cheat sheet for markup language, definition of SIR model, links to collections of open datasets)