it depends on the instructor ... anyone can create a course and sell it on udemy ... anyone ...
That’s why you always look at how many have been sold. Ratings mean nothing anymore. They can be hacked.
I’ve had a Udemy personal account for a few years. Money well spent.
A good amount of the IT certifications I earned came from there.
My main instructors are Jason Dion and Andrew Ramadyal (sp?) for CompTIA stuff.
I never got that much from Coursera.
Udemy has a much better selection and layout.