One thing I particularly appreciate from Udemy compared to other platforms is that there are many great (and not so great) courses covering obscure topics that are not available in Coursera, Edx, etc.
They can't match the depth of Udacity -- which, in my experience, is as deep as top graduate level courses -- they do have coverage.
Unlike the reviews I actually thought it was good and insightful, coming from Linux and macOS.
Same for this malware development course on Windows https://www.udemy.com/course/ehf-maldev-in-windows/#instruct...
This car maintenance one was also very useful
Car Maintenance Anyone Can Do https://www.udemy.com/course/car-maintenance-anyone-can-do/
Just a few examples.