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For Beginner bloggers I sugguested you some tips, although I do not think so beginners need courses to improve themselves. but things matter to blog are.
Search Engine Optimization (SEO), you should have knowledge about it.
Do what matter most. content which you are writing. its type, its style, its importance.
select an appropriate Blogging user-face, Wordpress or Google Blogspot.
I don't know about courses but one thing I know is - read as much as you can. Reading will help us improve our language, help us, our writing styles, help us explore new ways of writing, make our writing more error-free, and help us in becoming a true writer.
So for me, no courses just read, explore and write (and don't forget to review your own pieces of writing)
the most important thing for a blogger is to have that mind approach a reader wants to have or see in the content related to a particular topic. secondly the SEO and then the attractive words selection.
A course in journalism and academic writing; the former on reporting and relaying information and the latter to find and improve writing style.